how can I fix oil venting into the radiator? on 2001 BMW 325i

When I was checking the radiator I found oil in the water. I checked and sure enough it appears as if the engine is venting oil into the radiator from someplace. Any ideas? A friend suggested it my be an oil cooler gone bad, there is no water in the engine The car doesn't smoke to I don't believe it is a head gasket, Any thoughts?

Asked by for the 2001 BMW 325i
Oil pressure is higher in the transmission then in the engine, if this is automatic then you need to replace the Radiator!
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