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because your radiator water is leaking into your oil somewhere, could be a head gasket or a crack in the cylinder block between the water jackets & oil jackets, check out your radiator water condition chances are you will also have "foaming" there as well, the "foaming occures because oil & water doesnt mix & when you heat up the two liquids togather you will get a foam reaction as the water absorbs more heat than the oil therefor there is a difference in the tempretures between the two liquids in the same container. Get your car looked at by a mechanic.

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Q: Why would there be foam in your engine oil when you change it?
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If it is high enough to be splashed by the crankshaft it would foam up. That would cause a lack of oil pressure and engine damage.


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