1998 E320 115k = I have the same issue as the person in this thread:

http://www.peachparts.com/shopforu...d.php?t=145895

It's a yellow, butterscotch-pudding-like concoction that is collecting just inside my oil filler cap. The difference between the previous poster and myself is, I drive enough to heat up the engine thoroughly and I fear that it's a leaking head gasket. (even though my coolant level does not seem to be dropping) Is this a symptom of a head gasket allowing coolant to enter the engine oil? What other symptoms would I be seeing if it was a head gasket?

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1998 E320 4-Matic Wagon