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      02-28-2020, 02:07 PM   #9
Whipple's Avatar

Drives: 2015 BMW M6 Gran Coupe
Join Date: Jun 2011
Location: New York

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Originally Posted by thebmw View Post
I used to do oil catch cans back in the 2000's. So over 10 years ago. Boy time flies! I never really noticed a difference. But then again, I had not kept the cars for a super long time. I wonder if this really make a difference long-term if you are using fuel additives and cleaners such as Seafoam. That's kind of why I stopped using them.
If you go to the M5 forums I seen some pics of the oil residue splashed into the turbo housings ,so that means oil is getting into the intercoolers coating the whole intake system, if your running a tune and your in high boost and some oil gets pulled into the intake and mixes with the fuel it lowers your octane,
There is a check valve in the factory PCV valves if that fails it might not be good ,so all in all the catch are really not needed but a great fail safe and keep your intakes clean
2015 M6 Gran Coupe> DME stage 3 tune>Fabworx Catless downpipes>Full Meistershaft GTC exhaust 102mm GB tips>RK Carbonfiber front mount intakes>
Vorsteiner front and rear Carbon diffuser>Auto Tecknic Cabon shift paddles>3D Design aluminum pedals