Audi a4 oil catch can

Q: Are oil catch cans worth it?

The answer is yes. While a catch can wont stop every last particle of contaminant from entering the intake manifold and coating the valves in a direct-injection engine, the less unwanted buildup the better.

Q: Do oil catch cans increase horsepower?

An oil catch can doesnt add any power or make any cool noises so it is often overlooked when modifying vehicles. However, a catch can will ensure you always have a cleaner intake tract free of oil, and help keep your engine running better for longer.

The 034Motorsport B8 Audi A4/A5/Q5 2.0 TFSI Catch Can Kit is here! We've put months of engineering and testing to create the most complete and effective catch can kit on the market. The 034Motorsport B8 Audi A4/A5/Q5 2.0 TFSI Catch Can Kit features a completely new proprietary catch can, as well as an internally-channeled valve cover breather assembly to provide optimal crankcase ventilation, while keeping oil and water vapor out of the intake tract. This kit is designed to prevent oil from depositing in the intake manifold and intake valves, resulting in drastically reduced carbon buildup and extended life of the intake manifold flapper assembly.

Table of Contents Show

Oil Catch Can - How necessary?
Are oil catch cans worth it?
Can oil catch cans cause problems?
Is it worth fitting a catch can?
Do oil catch cans increase horsepower?

Features:

Complete PCV System Replacement
Prevents Crankcase Oil Deposits in Intake Manifold and on Intake Valves
Reduces Carbon Buildup
Ensures Proper Crankcase Ventilation
Eliminates Potential Boost Leak at PCV Assembly
Retains Factory Engine Cover
100% Bolt-In Installation

What's Included:

CNC-Machined Billet Aluminum 034Motorsport Valve Cover Breather Assembly (Black Anodized)
034Motorsport Modular Catch Can Assembly (Black Anodized)
-10 AN Catch Can Inlet/Outlet Hoses
No-Drill Mounting Bracket
Intake Manifold Plug & Boost Tap
Installation Hardware

Fitment:

2009 - 2016 Audi A4 (B8/B8.5)
- 2.0 TFSI
2008 - 2017 B8 Audi A5 (B8/B8.5)
- 2.0 TFSI
2008 - 2017 B8 Audi Q5 (B8/B8.5)
- 2.0 TFSI

This catch can kit will NOT fit Flex Fuel vehicles.

Installation Instructions:

Click Here!

Available Options:

Catch Can Oil Drain - Allows for service-free use of the catch can by draining collected oil back into the oil pan.

Note: Vehicles running catch cans in below freezing temperatures are advised to remove the catch can during winter months to avoid freeze-up issues. Race cars that need to run catch cans in freezing conditions should take extra steps to prevent freeze-up such as an electric heater or cleaning out the system regularly. Take care when routing the lines and avoid drooping, as that can allow oil/water to collect and freeze.

We found other products you might like!

Warning: This product may contain a chemical known to the State of California to cause cancer, birth defects, or other reproductive harm.

Learn More: www.p65warnings.ca.gov

Forum
Main Model-Line Discussion
B8 A4
Oil Catch Can - How necessary?

05-23-2016 09:45 AM #1
Veteran Member Four Rings

Oil Catch Can - How necessary?
With having a K04 I've been wondering about how necessary it is to have an oil catch can.
ECS has this one: https://www.ecstuning.com/Audi-All_R...ons/ES2816990/ but it doesn't come with piping/lines. I asked ECS for help with selecting the lines and they were basically unhelpful. Any advice on what to get?
Thanks!
�19 ▊RS 5 Coupe: Prestige, Daytona Grey, Blk Interior, Carbon Pkg, APR+/Intake, CETE AVC, Vorsteiner V-FF 104 20x10et30
'22 ▊RS 6: Glacier White, Blk/Gray Interior, Blk Optics, Exec, Driver�s Pkgs, Sport Exhaust, Red Brake Calipers, APR+, CETE AVC/ASC, Vossen GNS-1 20x10.5 et7, Stealth wrapped Piano Black Interior
05-23-2016 10:27 AM #2
Veteran Member Four Rings

Unfortunately there is no clear evidence confirming the usefulness of a catch can on our cars. You will get opinions but no factual data. I installed the 034 system several years ago and have collected and discarded quite a bit of contaminated water, with a very small amount of oil each time. I bought it with the idea that it may help and can't hurt, since I was concerned about our carbon buildup issue and keep my cars for the long term. It's impossible to know how much of the collected material would actually end up as carbon deposits. You collect mostly water with contaminants, and I have no idea if those contaminants are hydrocarbons that might have been deposited or would just get burnt off. Also, the visible oil layer is very small, and again it's impossible to know how much would have been processed through the engine and how much would end up on the intake parts.
Then there's the question of whether those additional deposits really make any difference to performance, since most of the carbon deposits will happen anyway through normal blow-by.
Bottom line? It may help and can't hurt.
05-23-2016 10:34 AM #3
Veteran Member Four Rings

Originally Posted by jfo
Unfortunately there is no clear evidence confirming the usefulness of a catch can on our cars. You will get opinions but no factual data. I installed the 034 system several years ago and have collected and discarded quite a bit of contaminated water, with a very small amount of oil each time. I bought it with the idea that it may help and can't hurt, since I was concerned about our carbon buildup issue and keep my cars for the long term. It's impossible to know how much of the collected material would actually end up as carbon deposits. You collect mostly water with contaminants, and I have no idea if those contaminants are hydrocarbons that might have been deposited or would just get burnt off. Also, the visible oil layer is very small, and again it's impossible to know how much would have been processed through the engine and how much would end up on the intake parts.
Then there's the question of whether those additional deposits really make any difference to performance, since most of the carbon deposits will happen anyway through normal blow-by.
Bottom line? It may help and can't hurt.
Thanks for the response! I'll probably go ahead with installing one.
Did the 034 unit come with lines? I'm kind of annoyed how unhelpful ECS has been.
�19 ▊RS 5 Coupe: Prestige, Daytona Grey, Blk Interior, Carbon Pkg, APR+/Intake, CETE AVC, Vorsteiner V-FF 104 20x10et30
'22 ▊RS 6: Glacier White, Blk/Gray Interior, Blk Optics, Exec, Driver�s Pkgs, Sport Exhaust, Red Brake Calipers, APR+, CETE AVC/ASC, Vossen GNS-1 20x10.5 et7, Stealth wrapped Piano Black Interior
05-23-2016 10:40 AM #4
Veteran Member Four Rings

Be cautious of the catch can you purchase. I know several which will fit the B8 chassis will also fit the B8.5. However, the blockoff plate/accompanying lines which some use will not fit underneath your engine cover. So unless you're OCD like me and like the look of the engine cover, make sure it fits underneath.
05-23-2016 10:46 AM #5
Veteran Member Four Rings

The 034 and CTS systems appear similar and come with all the pieces, including a replacement for the OEM PCV breather plate. Here's an old link to info on the 034.
http://www.audizine.com/forum/showth...ight=034+catch
05-23-2016 10:50 AM #6
Stage 2 Banner Advertiser Four Rings

We've never fitted our catch can in an allroad. We have a kit for the 2.0T B8 A4 but we've never fit it in an allroad. Could it fit perfectly? Possibly. But unless we test it our selves we will not be able to give a concrete answer.
So this is likely why Sales couldn't give you an answer on which hoses to use because they simply did not know.
Jason
05-23-2016 11:38 AM #7
Veteran Member Four Rings

Originally Posted by ECS Tuning-Audi
We've never fitted our catch can in an allroad. We have a kit for the 2.0T B8 A4 but we've never fit it in an allroad. Could it fit perfectly? Possibly. But unless we test it our selves we will not be able to give a concrete answer.
So this is likely why Sales couldn't give you an answer on which hoses to use because they simply did not know.
Jason
Understood. However that isn't what I was told when I asked for help. Basically the response was "go figure it out for yourself"
�19 ▊RS 5 Coupe: Prestige, Daytona Grey, Blk Interior, Carbon Pkg, APR+/Intake, CETE AVC, Vorsteiner V-FF 104 20x10et30
'22 ▊RS 6: Glacier White, Blk/Gray Interior, Blk Optics, Exec, Driver�s Pkgs, Sport Exhaust, Red Brake Calipers, APR+, CETE AVC/ASC, Vossen GNS-1 20x10.5 et7, Stealth wrapped Piano Black Interior
05-23-2016 03:00 PM #8

Veteran Member Four Rings

I have a catch can for the purpose of not having that horrid pcv valve in my engine bay. The fact that it catches blow by is awesome, but having a billet aluminum vac and boost leak proof setup is hard to beat.
2016 S3
2004 S4- 2.7t, Shaved bay, wire tucked, PTE5858 single turbo full build.
Instagram- @Thisisastickup
05-23-2016 03:02 PM #9
Veteran Member Four Rings

I should actually correct myself and say I meant oil seperator instead of pcv valve, since that is techincally what it is.

2016 S3
2004 S4- 2.7t, Shaved bay, wire tucked, PTE5858 single turbo full build.
Instagram- @Thisisastickup
05-23-2016 06:36 PM #10
Veteran Member Four Rings

Appreciate all the responses. Still trying to figure out what kind of lines are needed and where to get them in order to install the ECS unit. Considering the allroad engine bay is basically identical to the A4s I would imagine the same materials would usable.
Seems as though the 034 catch can not only comes with the lines but also replaces the PCV unit...
�19 ▊RS 5 Coupe: Prestige, Daytona Grey, Blk Interior, Carbon Pkg, APR+/Intake, CETE AVC, Vorsteiner V-FF 104 20x10et30
'22 ▊RS 6: Glacier White, Blk/Gray Interior, Blk Optics, Exec, Driver�s Pkgs, Sport Exhaust, Red Brake Calipers, APR+, CETE AVC/ASC, Vossen GNS-1 20x10.5 et7, Stealth wrapped Piano Black Interior
05-23-2016 06:50 PM #11
Veteran Member Four Rings

Originally Posted by pwdrskr
Appreciate all the responses. Still trying to figure out what kind of lines are needed and where to get them in order to install the ECS unit. Considering the allroad engine bay is basically identical to the A4s I would imagine the same materials would usable.
Seems as though the 034 catch can not only comes with the lines but also replaces the PCV unit...
This is why I chose 034.
2016 S3
2004 S4- 2.7t, Shaved bay, wire tucked, PTE5858 single turbo full build.
Instagram- @Thisisastickup
05-24-2016 05:08 AM #12
Veteran Member Four Rings

I do not have a K04, just running the latest K03 but I figured I'd share. I bought the ECS kit and I thought it was great (filling up the can every two weeks, I thought this was saving my butt) until I found it was capping the PCV system and pressurizing the crankcase, drawing oil directly into the can when the turbo is spooled. So, when I reinstalled the line from the PCV to the air manifold to utilize both systems I figured I could run like this and have all angles covered with zero issues. I checked the can 1, 2, 3, 4, and 5 weeks in and not a single. drop. of oil. So, the can was really useless, if not harming my engine by pressurizing the crank-case (Some people developed leaking covers and such). The Unit itself is beautiful, its very well put together and looks fantastic in the engine bay, but I'm chasing the best performance for my engine and this was not helping, maybe even hurting. I give ECS some credit, but I think they have some stuff to figure out. These are all my observations, just trying to give some insight on your options. The 034 replaces the stock PCV system, that I don't much about...
---------------------------------------------------------- IG: party_martyy ----------------------------------------------------------------------
---------------------2014 A4 - 6 Speed - Phantom Black Pearl -------------- Peep the Build ---------------------
05-24-2016 08:07 AM #13
Veteran Member Four Rings

Originally Posted by Party_Marty
I do not have a K04, just running the latest K03 but I figured I'd share. I bought the ECS kit and I thought it was great (filling up the can every two weeks, I thought this was saving my butt) until I found it was capping the PCV system and pressurizing the crankcase, drawing oil directly into the can when the turbo is spooled. So, when I reinstalled the line from the PCV to the air manifold to utilize both systems I figured I could run like this and have all angles covered with zero issues. I checked the can 1, 2, 3, 4, and 5 weeks in and not a single. drop. of oil. So, the can was really useless, if not harming my engine by pressurizing the crank-case (Some people developed leaking covers and such). The Unit itself is beautiful, its very well put together and looks fantastic in the engine bay, but I'm chasing the best performance for my engine and this was not helping, maybe even hurting. I give ECS some credit, but I think they have some stuff to figure out. These are all my observations, just trying to give some insight on your options. The 034 replaces the stock PCV system, that I don't much about...
I can't remember who it was, but another member here had the same issue as you and it was not good. I believe he needed up removing the whole setup in lieu of causing further damage.
05-24-2016 09:21 AM #14
Veteran Member Four Rings

Originally Posted by zcspec
I can't remember who it was, but another member here had the same issue as you and it was not good. I believe he needed up removing the whole setup in lieu of causing further damage.
Yea I can't remember either but yea, that's not on the car anymore haha.
---------------------------------------------------------- IG: party_martyy ----------------------------------------------------------------------
---------------------2014 A4 - 6 Speed - Phantom Black Pearl -------------- Peep the Build ---------------------
05-24-2016 09:30 AM #15
Veteran Member Four Rings

It was Lettuce - but it was never definitively identified if that can was the problem because he already had a consumption/leaky piston-ring situation going on. I also erred on the side of caution by re-attaching my manifold port, and like above, it rendered the can useless.
ECS looked into it, had an engineer chime in, and found no issues. I'm still on the fence about hooking it back up. The amount of positive pressure coming out of the valve cover still has me reluctant.
2013 A4 Quattro Brushed Steel / APR E85 Stage 2 / AG F421 Copper + Smoke + Neo Chrome / Eurocode FMIC + HFC / AWE Quad + CF Diffuser
build / instagram / flickr
05-24-2016 07:37 PM #16
Veteran Member Three Rings

Originally Posted by adamazing
It was Lettuce - but it was never definitively identified if that can was the problem because he already had a consumption/leaky piston-ring situation going on. I also erred on the side of caution by re-attaching my manifold port, and like above, it rendered the can useless.
ECS looked into it, had an engineer chime in, and found no issues. I'm still on the fence about hooking it back up. The amount of positive pressure coming out of the valve cover still has me reluctant.

I'm running it on my car right now, bypasses the same as @Party_Marty. Not a drop of oil. I've also got the bad oil consumption issue too. But ... I've got a new motor on order from IE, so will see what it is like with a fresh motor. I'll first check if it creates pressure when fully connected ... If it does, it's coming off immediately never to go back on. I don't want to introduce any problems with a nice fresh motor.
Follow my build on IG - https://www.instagram.com/AlterdA4
Integrated Engineering (Sport Short Block | Sport Head Assy | Intake Manifold w 4 x 890cc Injectors), BW EFR8474 Turbo, Custom 4.5" FMIC, Custom 3.5" SS Turbo back Exhaust, Tilton Racing Twin Disc clutch/PP & LWFW, 034 Billet Motor Mounts, AP Racing BBK 380(F)/330(R) floating rotors
05-24-2016 08:03 PM #17
Veteran Member Three Rings

Originally Posted by cybernet99
I'm running it on my car right now, bypasses the same as @Party_Marty. Not a drop of oil. I've also got the bad oil consumption issue too. But ... I've got a new motor on order from IE, so will see what it is like with a fresh motor. I'll first check if it creates pressure when fully connected ... If it does, it's coming off immediately never to go back on. I don't want to introduce any problems with a nice fresh motor.
Wow, Mr. Money Bags here LOL. As an engine builder, I want to KNOW how my engine was assembled, put together and have a spec sheet of what I said. IE does not offer any of that information; you're basically buying something blind. Don't get me wrong, IE has great products, I just wouldn't buy a 'solution' from a company, especially it being over priced like many 3 letter'd products by a certain company.
2010 Silver Audi A4 MT Sport Package w/ B&O
Stage 'X': FrankenTurbo F23L Ceramic Coated Manifold | Bully-Flo P&P Head | Ferrea Intake Competition Valves | Ferrera Exhaust Super Alloy Valves | IE ValveSprings & Retainers | HFC wrapped w/ DEI Titantium
Eurocode FMIC | Maestro Tuned | K&N Typhoon Intake | EuroCode Meisterwerk | StopTech BBK | 034 Motor Mounts & All Inserts | CTS PCV Catch Can
Build Thread
05-24-2016 08:43 PM #18
Veteran Member Four Rings

Originally Posted by adamazing
It was Lettuce - but it was never definitively identified if that can was the problem because he already had a consumption/leaky piston-ring situation going on. I also erred on the side of caution by re-attaching my manifold port, and like above, it rendered the can useless.
ECS looked into it, had an engineer chime in, and found no issues. I'm still on the fence about hooking it back up. The amount of positive pressure coming out of the valve cover still has me reluctant.
I have the 034 system, which replaces the OEM breather plate. At idle, there is also positive pressure at the oil filler. I believe this is to be expected, since the turbo is not pulling through the catch can at idle and the point of least resistance is the oil filler opening. When the cap is replaced, the next exit point will be through the breather plate, catch can, and on to the turbo. Evan though the turbo is not under boost at idle, I assume the crankcase can still vent by this route and not put undue pressure on engine seals. After several years of use, I have no issues and I have not heard of others with seal problems. The ECS system uses the OEM PCV plate/ diaphragm but with the intake no longer in the path I believe. I don't know if it will allow crankcase pressure to vent through the turbo at idle. As far as I can tell, it has no other place to go, so I would assume the ECS developers have addressed this?
In older vehicles, positive pressure at the filler or dipstick was a sign that the PCV system was plugged or broken, and would usually result in a blown seal. Our engine is somewhat different though and I don't fully understand the pathway for crankcase gases with the OEM PCV in place.
05-25-2016 05:10 AM #19
Veteran Member Four Rings

Originally Posted by cybernet99
I'm running it on my car right now, bypasses the same as @Party_Marty. Not a drop of oil. I've also got the bad oil consumption issue too. But ... I've got a new motor on order from IE, so will see what it is like with a fresh motor. I'll first check if it creates pressure when fully connected ... If it does, it's coming off immediately never to go back on. I don't want to introduce any problems with a nice fresh motor.
If it was me, I would not bother putting it on at all. I put mine on my car with 28k-ish miles (fairly new if you ask me) and then those things happened...Why risk it. If you consume a lot of oil with no system then I would consider something, but I would start with nothing on IMO. Good luck with the new engine tho!!
---------------------------------------------------------- IG: party_martyy ----------------------------------------------------------------------
---------------------2014 A4 - 6 Speed - Phantom Black Pearl -------------- Peep the Build ---------------------
05-25-2016 06:13 AM #20
Veteran Member Four Rings

Thanks again for all the responses! I think I'm going to hold off at this point.
completely unrelated, I did pull the trigger on this: http://europrice.us/turn-signal-modu...mi-dynamic-837
On a side note, I continue to be thankful and impressed with this community and how helpful it can be. Building my allroad has been a pleasure and the forums have been a fantastic resource.
�19 ▊RS 5 Coupe: Prestige, Daytona Grey, Blk Interior, Carbon Pkg, APR+/Intake, CETE AVC, Vorsteiner V-FF 104 20x10et30
'22 ▊RS 6: Glacier White, Blk/Gray Interior, Blk Optics, Exec, Driver�s Pkgs, Sport Exhaust, Red Brake Calipers, APR+, CETE AVC/ASC, Vossen GNS-1 20x10.5 et7, Stealth wrapped Piano Black Interior
05-25-2016 06:20 AM #21
Veteran Member Four Rings

You made the right choice, catch cans are a waste of money for these cars.
Stage 1 more than you RS3
05-25-2016 07:23 AM #22
Established Member Two Rings
05-25-2016 08:41 PM #23
Veteran Member Three Rings

Originally Posted by Allowencer
Wow, Mr. Money Bags here LOL. As an engine builder, I want to KNOW how my engine was assembled, put together and have a spec sheet of what I said. IE does not offer any of that information; you're basically buying something blind. Don't get me wrong, IE has great products, I just wouldn't buy a 'solution' from a company, especially it being over priced like many 3 letter'd products by a certain company.
Damn, had no idea an Audi engine builder in Ontario was in the midst ... I am definitely not moneybags! LOL, but want something that will last many years after such an investment. When I lived in Vancouver, I had high HP small bock Chevy motors built. The usual blueprinting, balancing, trusted combinations to build a solid motor. I checked with my local reputable Audi shop and they priced out a comparable build and in the end recommended as well to go with the built motor as their contacts didn't have any long term experience in building the Audi 2.0T motor. The price difference was only 1K CDN ... So, I felt more comfortable in going with the Integrated Engineering build.
Yes, I'm going in blind, but have yet to find a bad review of their engine builds. So ... yes somewhat of a fingers crossed situation.
Follow my build on IG - https://www.instagram.com/AlterdA4
Integrated Engineering (Sport Short Block | Sport Head Assy | Intake Manifold w 4 x 890cc Injectors), BW EFR8474 Turbo, Custom 4.5" FMIC, Custom 3.5" SS Turbo back Exhaust, Tilton Racing Twin Disc clutch/PP & LWFW, 034 Billet Motor Mounts, AP Racing BBK 380(F)/330(R) floating rotors
05-25-2016 08:48 PM #24

Veteran Member Three Rings

Might be because there aren't many IE 'built' engines out there.
Bottom line, a motor is a motor; just about all the same principles apply. The key though is this motor hasn't been around long enough to 'fully' blueprint yet.
2010 Silver Audi A4 MT Sport Package w/ B&O
Stage 'X': FrankenTurbo F23L Ceramic Coated Manifold | Bully-Flo P&P Head | Ferrea Intake Competition Valves | Ferrera Exhaust Super Alloy Valves | IE ValveSprings & Retainers | HFC wrapped w/ DEI Titantium
Eurocode FMIC | Maestro Tuned | K&N Typhoon Intake | EuroCode Meisterwerk | StopTech BBK | 034 Motor Mounts & All Inserts | CTS PCV Catch Can
Build Thread
02-23-2018 06:33 PM #25
Veteran Member Four Rings

Hi guys,
I just watched a YouTube video on DI, PI (port injection) and preventive measure of carbon buildup in a DI car. The guy in the video mentioned about using a good oil catch can to catch 95% of oil vapor and blow by. Is there an oil catch can that really works on our car? Or is it still the same verdict that oil catch can is waste of money? Also does anyone use injector cleaner with a good result?
02-24-2018 09:43 AM #26
Active Member One Ring

Originally Posted by AutoRacer100
Hi guys,
I just watched a YouTube video on DI, PI (port injection) and preventive measure of carbon buildup in a DI car. The guy in the video mentioned about using a good oil catch can to catch 95% of oil vapor and blow by. Is there an oil catch can that really works on our car? Or is it still the same verdict that oil catch can is waste of money? Also does anyone use injector cleaner with a good result?
You watched savagegeese's video? I'm curious for our cars too. From this thread, it seems as if not very useful for our cars. I have about 130k kms on mostly highway driving and I do plan on keeping my car long term as a daily.
Sent from my SM-G955W using Audizine mobile app
02-24-2018 02:11 PM #27
Veteran Member Four Rings

Originally Posted by choisteven
You watched savagegeese's video? I'm curious for our cars too. From this thread, it seems as if not very useful for our cars. I have about 130k kms on mostly highway driving and I do plan on keeping my car long term as a daily.
Sent from my SM-G955W using Audizine mobile app
Yes Savagegeese! I love his review on cars! He seems very technical and knows a lot about cars. Anyway none of oil catch can is able to pull some nasty liquid out of our engine based on this thread. Savagegeese stated that a carbon clean is needed for every 30k miles. That would be a ridiculous high maintenance on our cars if that's the case. My car is 8 years old and has only 36k miles mostly local traffic driving. I wonder how dirty the intake valves on my car. It's frustrating to see a such high maintenance cost while I want to keep the car for a long term. But then most newer cars have DI. So not many options for me to chose from if I want high performance cars.
02-24-2018 03:50 PM #28
Veteran Member Three Rings

To solve an oil loss issue - absolutely worthless.
02-24-2018 06:12 PM #29
Veteran Member Four Rings

Originally Posted by flowhigh
To solve an oil loss issue - absolutely worthless.
Use a good oil catch can to slow down the carbon build up.
02-24-2018 06:56 PM #30

Veteran Member Four Rings

Originally Posted by AutoRacer100
Use a good oil catch can to slow down the carbon build up.
This is one of those where you will not find any data or a factual answer...only opinions. I've used one for six years and can confirm that the amount of oil captured is very small. Perhaps 2% of the total amount of fluid is oil that floats to the top of a jar over time. The rest is water with various combustion contaminants. Only vapour captured when there is no boost goes to the intake. The remainder is directed to the turbo.
Given that most of the carbon buildup by far, results from blowby in the cylinder, it's very difficult to guestimate how much impact the catch can has. Perhaps some of the other non-oil stuff in there might contain hydrocarbons that could deposit on the valves...don't know.
To me it's in the category of "can't hurt but might help". I have one so I continue to use it.
02-24-2018 10:49 PM #31
Veteran Member Four Rings

The main benfitit if the catch can in my opiniom is the upgrade pcv system the stock design is poor plastic pos the 034 kit is nice i run it but have the drain plug kit as well so i have never seen how.much oil is in there.
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02-26-2018 10:47 AM #32
Veteran Member Four Rings

Do all cars get some product from blow by of the engine? If so, I don't get why you guys did not get a drop of liquid/water in your catch can? The liquid/oil/fuel residues from the engine goes directly into the PCV and oil catch can connects to the PCV lines catches all those nasty stuff before the PCV. That makes sense to me that a catch can should catch all that and nothing should go into PCV.
02-26-2018 12:59 PM #33
Veteran Member Four Rings

Originally Posted by AutoRacer100
Do all cars get some product from blow by of the engine? If so, I don't get why you guys did not get a drop of liquid/water in your catch can? The liquid/oil/fuel residues from the engine goes directly into the PCV and oil catch can connects to the PCV lines catches all those nasty stuff before the PCV. That makes sense to me that a catch can should catch all that and nothing should go into PCV.
I'm not sure I understand your comment, but to clarify....all cars will experience some blow by with combustion gases reaching the valves and depositing carbon over time. The catch can(some versions) replaces the PCV and directs crankcase vapour to the catch first before being pulled through to the turbo. The line that directed vapour to the intake and valves is removed, so the small amount of oil that may have deposited on the intake valves is eliminated. The majority of liquid found in the can is indeed condensed water vapour. For example,after about 2500km's in the winter, I will remove about 500ml from the can. It's all contaminated water with a small amount of oil. If I leave it sit in a jar for a few days I will have perhaps 1/16" of oil film on top of 4" of water with other combustion by products. As i mentioned above, I don't know if those contaminants in the water would contribute to carbon buildup.
02-26-2018 01:15 PM #34
Veteran Member Four Rings

I have the CTS catch can and it gets filled with water/vapor almost every other week. I've been dumping the can every other week, and more often when its cold out and the amount of water/milky crap I pour out is more than enough justification for me to keep running it. I'll video next time I dump it if you're curious to see what it looks like.
02-26-2018 01:42 PM #35
Veteran Member Four Rings

I have a CTS catch can on my Allroad. Under the engine bay is identical to a B8.5, meaning the PCV piping is a little different than a B8 so you have to get a can that�s meant for a B8.5. As far as I can tell only CTS has one, albeit I haven�t checked out the ECS one for a while.
2013 Allroad - 12.18s 1/4 mile
CTS K04| APR | IE | Magnaflow | AirLift 3H | Hotchkis | Vorsteiner
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past: B6 S4, B5 A4
02-26-2018 02:04 PM #36
Senior Member Three Rings

I'd be very wary of using a block-off plate. The oem pcv assembly can pull vacuum from either the turbo or intake manifold allowing it to provide a constant source of vacuum for the crankcase. In B8 motors, this is crucial for the low-tension piston rings to seal reliably. Further, these engines have a primary air/oil separator buried further down in the block. What sits on top is a combination of a secondary air/oil separator and series of valves controlling which pathways open when to maintain continuous vacuum to the crankcase. You're best bet, is a catch can setup that work in conjunction with the factory pcv assembly.
03-26-2018 08:55 AM #37
Veteran Member Four Rings

What is the symptoms of dirty intake valve (nasty carbon buildup)? Poor gas mileage, lack of power and rough idle?
My car is over 8 years old and I wouldn't expect it runs like a brand new car. But I do noticed tiny vibration at idle and lack of power for sure. 2010 A4 with 37k miles (80% local street driving, stop and go). I can only get 17.5 MPG (80% local, 20% highway) now. Can I get 21 MPG local driving and get all the lost power back with a intake carbon cleaning?
03-26-2018 05:54 PM #38
Senior Member Three Rings

Originally Posted by AutoRacer100
What is the symptoms of dirty intake valve (nasty carbon buildup)? Poor gas mileage, lack of power and rough idle?
My car is over 8 years old and I wouldn't expect it runs like a brand new car. But I do noticed tiny vibration at idle and lack of power for sure. 2010 A4 with 37k miles (80% local street driving, stop and go). I can only get 17.5 MPG (80% local, 20% highway) now. Can I get 21 MPG local driving and get all the lost power back with a intake carbon cleaning?
Winter blend usually brings down MPG. I have a 2014 A4 and I get about 18mpg driving to work for 6 miles 50% highway using 93 octane shell in dynamic mode. In summer time, I get to around 24-28 driving on freeway.
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03-27-2018 06:37 AM #39
Veteran Member Four Rings

Originally Posted by Slim0531
Winter blend usually brings down MPG. I have a 2014 A4 and I get about 18mpg driving to work for 6 miles 50% highway using 93 octane shell in dynamic mode. In summer time, I get to around 24-28 driving on freeway.
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Really? Let me monitor mine in the upcoming summer season.
03-27-2018 07:06 AM #40
Veteran Member Four Rings

Originally Posted by Slim0531
Winter blend usually brings down MPG.
No question. I get my best mileage right now. They've stopped putting anti freeze in the gas, and I'm not running the air. I get at least 1 mpg better in the early spring and late fall.
11 A4 Q, Prestige, Black
173,000 miles, APR Stage 1

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Are oil catch cans worth it?

The answer is yes. While a catch can won't stop every last particle of contaminant from entering the intake manifold and coating the valves in a direct-injection engine, the less unwanted buildup the better.

Can oil catch cans cause problems?

Curing the nonexistent problem of oil blow-by with a catch can, which pressures up the system and blows a seal, allowing sump oil to escape could have the nasty feedback effect of catastrophic engine failure, and you will not be covered by warranty.

Is it worth fitting a catch can?

The truth is that while oil catch cans can be beneficial, they are largely only beneficial under certain circumstances, and then only if the device was made by a reputable manufacturer, and installed by a reputable service provider.

Do oil catch cans increase horsepower?

An oil catch can doesn't add any power or make any cool noises so it is often overlooked when modifying vehicles. However, a catch can will ensure you always have a cleaner intake tract free of oil, and help keep your engine running better for longer.