I used to own an 84 190E that did the same thing. I never did determine the cause of it but on some cases it was bad enough that it soaked the air cleaner. I believe attached to your air cleaner is a type of pressure relief which may allow the oil in.
A tech would know best but its could be a possible cause.
I would be curious what caused it to if it wasnt that relief opening.
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Afshin
Current:
02 C32 AMG
Previous:
92 500E
84 190E 2.3 5 Spd
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