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You may have a blown head gasket. Have it pressure tested. The head gasket keeps the cylinder head sealed from the water that circulates through the heads to keep them cool. If the gasket gets a hole in it, then there is a gap in which oil can get into your coolant. Make sure what you are seeing is OIL in the coolant first.

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Q: What would cause engine oil to be collecting in my radiator coolant when no coolant is in my crankcase oil on a 2002 Pontiac Gran Prix SE with 3.1 engine?
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