Articles, Blog

How Does a Catch Can Work and What Does it Do?

October 27, 2019

Today in Deutsche Auto Parts we are going
to be going over how a catch can works and the benefits of this system
[Intro: Deutsche Auto parts [DOY-chuh] 00:00:07- 00:00:12]
So how does the catch can do its job? The catch can will take the air from the engine,
run it through the hose, through the can itself, and then once the air is cleaned it will send
the air back into the engine to be re-burned. So how does it clean the air? The catch can
will take the air, send it through, it will hit the baffles inside the can itself. When
it hits those baffles it will then condense causing the fuel, oil, and other contaminant
vapors to separate. It will then cause them to fall to the bottom of the can sending the
clean air back into the engine to be re-burned. So why would you want a catch can on your
vehicle? Catch can have two major purposes on vehicles. The first one being to prevent
potential carbon builds up on direct injection engines. This will take the air as its
coming through to be re-burned, clean out all the contaminants that could potentially
cause carbon and then send the air back. The other application would be for performance
or race applications. This is most often used to keep the cleanest air you can possibly
get going back to the engine. The catch can will catch all those containments, trap them,
send the clean air back. Thanks for watching, be sure to subscribe
and leave any questions, ideas, or feedback in the comments below.


  • Reply jscricca November 13, 2014 at 3:36 am

    Great videos lately. Keep it up.

  • Reply Gli_Fahrenheit November 14, 2014 at 11:27 pm

    @Deutsche Auto Parts- Your Source for Everything VW and Audi  Do you think this method can work if i do it every month ? VW MKV GTI 2.0t FSI – intake valve cleaning diy  Thank you 

  • Reply kyolicila April 24, 2015 at 6:03 pm

    I bought an Audi a year and a half ago and it has a catch can in it. At the time I didn't know what it was and the previous owner told me to drain it every oil change but I forgot about it. I don't know how full it is now but what would happen if the catch can is full?

  • Reply Damon Williams September 4, 2015 at 8:07 pm

    I dont know crap about cars and things but im learning. But question if you have white smoke coming from the tail pipe would this help

  • Reply Damon Williams September 4, 2015 at 8:08 pm

    I dont know crap about cars and things but im learning. But question if you have white smoke coming from the tail pipe would this help

  • Reply cougercruiser February 3, 2016 at 6:58 am

    Does anyone have proof that these things actually work? I can't seem to find a thread where someone has one installed and checked for carbon build up over time.

  • Reply Kaan Ecer February 11, 2016 at 11:52 am

    Firstly, thank you for your videos which are helpful for all audi and vw users. I have a question about catch can. I have 2.0 tfsi bwa engine on my audi tt and I replace my pcv valve with pcv delete kit. What is the difference between oil catch can pcv and pcv delete kit. Should I use oil catch can or pcv delete kit is efficient like oil catch can? Thank you for your actions.

  • Reply Tony Flick May 4, 2016 at 7:16 pm

    They work extremely well, I have the suplen catch can on my mk6 gti and I'm astonished by how much crap it does catch…

  • Reply Ned June 11, 2016 at 10:02 am

    I can understand that it will help but not eliminate carbon build up on the intake valves for direct injection engines but the performance benefit is questionable.

  • Reply imReedy July 25, 2016 at 1:34 am

    Hey, i just purchased a 20th GTI with this exact catch can already installed. Does it need to be cleaned, and if so how regularly?

  • Reply Erick R July 28, 2016 at 4:33 pm

    these close system oil catch cans don't address the problem of equalizing crankcase pressure. sure crankcase gases will be cleaned but where is that excess pressure going to go?

  • Reply Romario Smith August 18, 2016 at 10:21 pm

    how do you replace the oil that gets in there?

  • Reply SunLoverMan January 3, 2017 at 6:26 pm

    it looks that catch can is useless for euro version of tsi gen3 due to combined injection fsi+mpi

  • Reply Errol MV February 26, 2017 at 2:48 pm

    hi paul, can you please update the link on where to find this product from the link is broken

  • Reply Tiago Ferreira April 4, 2017 at 9:44 pm

    im really intrested to instal a cacth can at my seat leon 1.2tsi. it has a stage 1. and sometimes it snugles climbing the hill. and im really suspecting that it could bebecause the "dirt" beind the valves. already change hpfp, and sparkplugs. And the problem continues… help please.

  • Reply steffo2oo2 April 23, 2017 at 9:27 am

    #shoutout from #deutschland

  • Reply Welile Boysie April 24, 2017 at 4:59 am

    hi I have 1.6L 16V naturally asperated polo.. will the catch can make a difference in my engine.. since i see only you recomending TSi and TFSI engines.

  • Reply Stefhan Steer July 7, 2017 at 11:17 pm

    Hey man what are the benefits of running catch can or just pcv pipe straight into a catcher…. and blocking of intake pipe fitting or putting small air filter on it… this is on a 2.5td bounty cheers

  • Reply Loyal Honda Fan August 4, 2017 at 5:37 pm


    My car after a big seafoam treatment and pcv valve replacement still burns some oil, i am sure my engine is OK, and i saw the oil in the pcv valve, can i use the oil catch can to save my oil from burning? Will that oil in the can will get back into my engine?

  • Reply Shay N August 5, 2017 at 8:30 am

    Hi Paul not sure if you can help, I installed a catch can on my mk6r and the car is now having smoking issues on idle, if I'm driving there's no smoke at all, do you know what could be causing this issue?

  • Reply Santiagoafull August 20, 2017 at 10:00 pm

    I WILL USE THE TRANSLATOR, FORGOTTEN THE ERRORS: Excellent your videos! One question: crank case ventilation port and PCV out, are they communicated internally? If I cancel, for example, the rear exit, the one that goes through a corrugated pipe in the form of S to the turbo manifold, ALL that vent will leave by the PCV? Is there any risk of accumulation of oil or dirt if I put the plug at the rear outlet of the valve cover? I see that you left that pipe and that you are not going through the catch can. I ask you this because I'm doing a home PCV, THANK YOU, SANTIAGO FROM ARGENTINA, Club de Vento and Audi.

  • Reply Mr Mojo Risin August 29, 2017 at 1:22 am

    Guys, if this was such a big issue for the engine, don't you think VW would address it? The performance gains are minimal if at all. Save your money guys

  • Reply vhjioa February 9, 2018 at 11:24 pm

    Is this really an issue when the VW EA888 engine has dual injection (both port and direct) ? carbon build-up shouldn't be an issue as the fuel coming in mixed with the air with clean the back of the valves.

  • Reply Denson Dayao March 17, 2018 at 11:50 am

    Catch can sucks

  • Reply Maody66 April 1, 2018 at 1:08 pm

    And here is the visible reason WHY you should install it, VWR best…

  • Reply Luke AOD April 21, 2018 at 5:24 pm

    Damn just want some good info on oil catch cans with actual evidence. This video is clearly subject to bias as it's made by the guys selling it. Trying to prevent carbon on my GTI, and I scoured the internet looking for some real evidence and all I got were idiots on Reddit claiming that the GTI carbon issues are a myth. Mine were coated and I mean fucking COATED to such extent as causing cold start misfires at 60k. I had a fat hand full of the shit come off the valves. Since then, I've been only using strictly 93 was using 91 octane fuel if 93 wasn't readily available. Now also using fuel system cleaner after each oil change. At 75k now and I pulled my intake manifold to have a little look-see and it's better than I feared it might be but it is accumulating. I'm wanting to jump right into a stage 2 tune w/ downpipe but that's likely going to double the rate that carbon collects. Hell on Cobbs website for the GTI stage 2 tune it basically says in plain words that after the tune you'll have to clean up valves every 40k, and you've got to imagine they are being optimistic.

  • Reply chris richmond January 11, 2019 at 4:24 pm

    Can you install a catch can with stock pcv?

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