Just picked up a 1988 300E, runs great but in the coarse of 3 weeks the crankcase has filled up with fuel mixing in with the oil.....Drained the oil and approxiamtely 12 US Quarts came out!!!....What could possibly be causing the fuel to bleed into the crankcase.......When I got the car 3 weeks ago the oil level was normal!....Thanks in advance!

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Currently Driving
2006 E320 CDI
1999 E300 Turbo Diesl
2002 ML500
1995 E320 Station Wagon


MBs I've owned
1997 E320 Assassinated by Pine Tree
1987 300E Wife Killed Engine
1981 300D Stretch Limo Total Loss
1970 250 Coupe 212,000 mi.
1974 450sel 184,000 mi.
1974 240D 377,000 mi.
1977 300D 204, 000 mi.
1979 280se God Only Knows!
1983 240D 130,000 mi.
1972 220D 280,000 mi.
1983 300SD 244,000 mi.

That amount of fuel will ruin the engine if it hasn't already. Whats the fuel mileage like and does the engine run OK? Stop driving it until you fix it!

Gilly

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Click here to see a photo album of my '62 Sprite Project Moneypit (Now Sold)

The source of fuel in the crankcase shouldn't be much of a mystery, just think like a gas molecule. After getting mixed with air and pressurized into the the cylinder, the biggest escape route is geting past the piston rings in at least one of the cylinders and then down into the crankcase. The only other avenues of escape are in the valves, which would lead upwards to the camshaft and valve cover area, where mixing with the oil would take you back down to the crankcase.

Gilly, I just removed the air filter and it looks like it hasn't been changed in many years, almost completely clogged....My question is: "Would the restriction in airflow cause the fuel to not atomize as well, thus causing excessive liquid fuel buildup in the cylinders?".........The car runs GREAT but the fuel consumption is extremely excessive in comparison to my 1987 300E....Thank you!

__________________
Currently Driving
2006 E320 CDI
1999 E300 Turbo Diesl
2002 ML500
1995 E320 Station Wagon


MBs I've owned
1997 E320 Assassinated by Pine Tree
1987 300E Wife Killed Engine
1981 300D Stretch Limo Total Loss
1970 250 Coupe 212,000 mi.
1974 450sel 184,000 mi.
1974 240D 377,000 mi.
1977 300D 204, 000 mi.
1979 280se God Only Knows!
1983 240D 130,000 mi.
1972 220D 280,000 mi.
1983 300SD 244,000 mi.

The fuel pressure regulator may have a leak. Check the vacuum line for fuel.

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Regards

Warren

Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL

ENTER > = (HP RPN)

Not part of the in-crowd since 1952.

First I would pull the vent off the valve cover with the engine running and of course fresh oil in it! If you hear and feel a ton of air flowing out of there you most likely have bad valve seals! Where gas flows so will air. Next of course check the fuel regulator by pulling the vacuum line on it and make sure no gas is pouring out of it. That leads back to the intake and through the same rubber hoses that go back to the valve cover vent on my M102 motor and I guess could flow back into the valve cover. Last is the big one and the most likely problem, that the rings on the pistons have lined up and the gas is going straight to the oil pan! That would mean removing the head and checking the rings for alignment. It happens unfortunatelly and of course means new rings! Good Luck!

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~Jamie
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2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's.

1986 190E 2.3 Black, Auto, Mods to come soon.....