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My 1997 ford f150 has oil in my coolant reserve tank but no water in my oil.
1996 Ford F-150

My 1997 ford f150 has oil in my coolant reserve tank but no water in my oil.

(1996 Ford F-150)
Truck has never over heated , Already changed the oil adapter gasket. Has anyone heard of an external oil cooler going bad ??
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Popular Answer
The external oil coolers can leak internally but cylinder head gaskets can cause cross contamination as well without water/coolant getting into oil pan. Depending on where the gasket breaks, the compression of the cylinder is much higher than cooling system pressure. That would allow for oil to enter cooling system but no coolant in the engine oil.
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Oil Leak Diagnosis
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The external oil coolers can leak internally but cylinder head gaskets can cause cross contamination as well without water/coolant getting into oil pan. Depending on where the gasket breaks, the compression of the cylinder is much higher than cooling system pressure. That would allow for oil to enter cooling system but no coolant in the engine oil.
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