Rick's Free Auto Repair Advice

Posts Tagged: yellow gunk under oil cap

Yellow gunk under oil cap

What is the yellow gunk under oil cap? Yellow gunk in the oil cap does NOT AUTOMATICALLY mean a failed head gasket Let’s get this straight from the get-go; Yellow gunk inside the oil filler cap is NORMAL in winter if the vehicle is driven short distances. By itself, it is NOT a sign of a head gasket failure. What to check if you see yellow gunk under the oil cap A head gasket can fail in several ways; 1) Breach between the cylinder and a cooling passage 2) Breach … Read More


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