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As a mechanic with many years of experience there are only a couple of ways engine oil can enter the coolant system Someone added oil to the coolant overflow tank or radiator. A crack in between an oil gallery and a coolant passage either in the engine block or the cylinder head(s). There could be some other reasons but it has been my experience that ...


More than likely your thermostat is stuck in the open position or gets stuck in the open position after the engine warms up. Your best bet is to have it replaced. Since you didn't provide any information about what type of car or any other specifics, there is no way I can answer this question further.

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