Well mine was not that simple it seems. I have replaced all the components about 4 weeks prior. The problem is my wife drove the car from drive way to work, about 5 min each way, sometimes 10 min. the car never got on freeway to dry oil out. Then when cold strikes it freezes. Really sucks because they are forcasting upper 40s from here on out. But cant tell the future so who knows.

if you remove the engine cover you will see two large rubber hoses going from left to right accross top of rear intake. those are the hoses that like to freeze and plug up with condensation/oil goo... they are designed to draw in vapors/oil from drivers side valve cover and it goes to the oil seperator (funnel looking thing on rear of intake) the oil/vapors are designed to swirl and oil sticks to outer wall while vapors are sucked into the rear cover labrynth on the intake manifold. the problem is these hoses freeze so the crank case vacuum now turns the small hose under the intake into a straw and sucks engine oil directly from engine oil sump into intake. So in a nutshell their design sucks.

a simple pcv valve to the intake would suffice. if they are concerned about oil in the vapors they could have put a baffle on the valve cover. easy peasy. but they over complicate things.

the ccv system on the sedans is totally different and they dont really have the problem with sucking oil directly into the motor.

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BMW Level 1 Tech