'Yellow' oil from crankcase vent pipe.

[gas guzzler]

Can anyone help.

In the crank case vent pipe that fits onto the air filter housing, there is some yellow oil residue (we're talking a bright golden yellow!), as well as oil fumes that increase when the engine is reved.

I thought it may be water getting into the engine, but there is no residue on the oil filler cap and no sludge in the water expansion tank which I though were the normal placed to look

Any ideas????


'88 560SEC 176,000 miles