I have a 2002 clk 320, and I just opened the oil cap and there is some goopy looking yellow stuff on the cap. Can anyone tell me what it is, and what would cause it?

__________________
For the Saved, this world is the worst it will ever get.
For the unSaved, this world is the best it will ever get.

Clk's Ebay Stuff BUY SOMETHING NOW!!!