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You've probably got either a bad head gasket of a cracked head.That's the only place where the oil and coolant come in close contact.

It may be Transmission Fluid if you have an automatic transmission - check your trans fluid level, and check for milky looking appearance to the trans fluid. The transmission cooler is integrated into the radiator and leaks can develop between the two.

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14y ago
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Q: Why would there be oil in the radiator of a 2006 f350 diesel?
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