All engines have to deal with crankcase pressure; it costs you power, gas mileage, and can cause leaks. Your PCV system works to fight this, but it is restrained by emissions. This oil cap from Vargas Turbo installs in seconds and goes a long way towards reducing crankcase pressure on any modern BMW that it will fit on. It uses the standard BMW oil cap style of two fins that hold it in place. I can guarantee it will fit the E70 X5M and E60 M5; after that, you have to check individually. It will most likely fit an all N54/N55 cars. There's really no reason not to if it will fit; it's less than $100.

https://www.fcpeuro.com/products/bmw-...

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