so i have a quick question...on older 123s where exactly does the oil drain tube go for the crankcase vent lead to? On the 123 i used to have i had the oil pan off before and it seems to me the line goes into the flat part of the casting above the drain pain but does anyone have a pic? i have a 1985 126 and it doesnt have that line because it has a different air filter set up. the problem is i put an aftermarket air filter on and oil seperater and there is nowhere for the oil to drain or go back into the system...the other question is do i really want that oil to go back in?

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• 1993 Mercedes-Benz 400E *146,000 Miles*
• 1985 Mercedes-Benz 300SD Turbo Diesel Biodiesel *SOLD @ 346,000 Miles*
• 1984 Mercedes-Benz 300D Turbo Diesel Biodiesel *SOLD @ 284,000 Miles*

Yeah, it drains back into the oil pan, better than blowing around under hood.
Should be the same set up as a 123, same engine.
Is one of your cars a Cali?

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83 SD

84 CD

ya my 85 300SD is cali. it does not have that drain tube so i am not sure where the oil would go. Does the drain tube on the 123s have a check valve?

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• 1993 Mercedes-Benz 400E *146,000 Miles*
• 1985 Mercedes-Benz 300SD Turbo Diesel Biodiesel *SOLD @ 346,000 Miles*
• 1984 Mercedes-Benz 300D Turbo Diesel Biodiesel *SOLD @ 284,000 Miles*

The cali dumped the vapor back into the air filter in the corner, and what fell all of the way down, dripped out of the bottom of the air cleaner I believe.
My 85 CA. did not have that either. I ran a hose down under the car after coverting it to federal type.

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83 300SD Dark Silver Dark brown inside