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Q: Oil in coolant.

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Oil in coolant in radiator on my Hummer.

A: Oil in your coolant is a bad sign. This usu...

Oil in your coolant is a bad sign. This usually indicates a leaking head gasket or cracked head. A cooling system pressure test and block test will be able to determine this. I suggest having a qualified technician, such as one from YourMechanic, inspect and repair your Hummer.

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