[JayZap16]

So today I was installing new drop in K&N engine air filters and removing the charcoal engine filters and noticed some thing in the passenger intake tube. See pics below:

In the passenger side I noticed quite a bit of engine oil coating the tube inside. Is this a issue? turbo blow back? Never seen this before or know much about this phenomena

[shawnhayes]

Well, crap.

This is a known common problem with OEM intake systems.

Commonly, the PCV system is vented to the intakes. This results in oil vapor in the intake system. What you see is the results.

This is the reason for "catch can" systems in many cars. Looks like ours needs one too. DAMMIT.

I found one for the F10. Sigh.

https://burgertuning.com/products/bm...u-bmw-m-engine

Shawn

[JayZap16]

Showed these photos to my service advisor and he said the techs said this is common and not a concern.

[shawnhayes]

Originally Posted by JayZap16

Showed these photos to my service advisor and he said the techs said this is common and not a concern.

You are exactly right. It is not a concern FOR THEM.

Replacing motors and cleaning valves at 100,000 miles are something they are absolutely OVERJOYED to do.

So here's both Road and Track and Engineering Explained's position on it...

https://www.roadandtrack.com/car-cul...tch-can-works/

Honda makes this part of the engine design from the factory:
http://honda.automotive-manuals.com/...711KCAT00.HTML

We had to get them for tuned GT-R's because there was so much oil in the intake stream it would mess with the Air/Fuel ratio and tuning because of the ingested oil vapor.

If you don't run much at wide open throttle and you don't care much about dirty valves at 100,000 miles, it isn't a concern. Honestly. Some people, it is.

Shawn

[Demon Barber]

I wish someone would make an oil catch can or two for this car, but probably haven't because there's just no room under the hood for more hardware. Any idea how big/expensive of a job it is to clean the valves?

[WickedBMW]

Originally Posted by shawnhayes

Well, crap.

This is a known common problem with OEM intake systems.

Commonly, the PCV system is vented to the intakes. This results in oil vapor in the intake system. What you see is the results.

This is the reason for "catch can" systems in many cars. Looks like ours needs one too. DAMMIT.

I found one for the F10. Sigh.

https://burgertuning.com/products/bm...u-bmw-m-engine

Shawn

Since F90 has a same engine, wouldn't these oil catch cans work for 2018 and up models?

[shawnhayes]

Originally Posted by WickedBMW

Since F90 has a same engine, wouldn't these oil catch cans work for 2018 and up models?

I've got the funny feeling it would. But it would require some modification I suspect. Looks like the plumbing has changed a little.

Shawn