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Originally Posted by DR.DIESEL
Crankcase oil builds up in these M137 motors right where the intake plastic pipes and the manifold meet. It will drip out of the joint.
There are some known issues with the PCV system on these cars.
If you have warranty or service contract, you might want to use it.
Regards
DR.D
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Very true however, I've found the most common reason for oil in the intake is due to the Cylinder Shut-Off (CSO) feature. The M137 can shut off the entire left bank under certain conditions to improve fuel economy. This can allow blow-by due to the pressure/temperature differences of the inactive cylinders. Fortunately, the CSO can be de-activated with SDS. If I owned any M137 equipped MB, the first thing I'd do is de-activate CSO. Eventually the oil in the intake will cause ignition mis-fire which will quickly damage the (very expensive) ignition coils.