rich,

You did not say what year. I can respond regarding the M103 engine. There is none. The crankcase is ventilated through the air cleaner directly.

Good luck,

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Larry Bible
'01 C Class, Six Speed
'84 Euro 240D, manual, 533K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles