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Most likely a blown head gasket. Or if you own a GM it's probably the intake manifold gaskets. There is a class action law suit that has been settled , but getting any cash will be a chore. I have a 96 GMC and just changed them for the second time.

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15y ago
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16y ago

if there is engine oil in the antifreeze generally indicates a cracked head on the engine

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14y ago

You probably have a blown head gasket or a warped head

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11y ago

A leak somewhere, possibly cracked head or head gasket.

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Q: What causes antifreeze to leak to oil?
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