Thread: Strange Yellow Residue on Oil Cap?

Looks like you were cooking ramen in there.

Unless you use the yellow coolant instead of dexcool... that's the wrong color.

You'll hate this question: Is your oil filled to the correct level?

Also, if you want to be 100% sure about a gasket problem, send the oil out for a test. It's $10-$25, depending on who you use. They'll give you a chemical break down of what's in the oil. Things like potassium only occur in coolant.