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It can cause your oil cap to blow right off, foam around the oil cap is more likely to be water or coolant. Get it checked right away because it can damage your engine. It's usually a sign of a bad head gasket, it lets water into the oil and oil into the water. Check your radiator to see if there is oil in the water and if the water is low.

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17y ago

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Why do you have an oil like substance mixed in your radiator of your 2001 buick century and what do you do to fix it?

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