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Posts Tagged: yellow gunk under oil cap

Yellow gunk under oil cap

What is the yellow gunk under oil cap? Should you be worried if you find yellow gunk under oil cap? There’s a pretty common misconception in the car world that yellow gunk under oil cap always means you’ve got serious engine problems like a blown head gasket or sludge buildup. Yellow gunk under the cap CAN mean that if you have other corroborating signs. But yellow gunk under oil cap, by itself, is NOT an indication of a blown head gasket or sludge. What to check if you see yellow … Read More


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