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Not sure if this is your problem, but my 1996 Olds Cutlass Supreme leaked coolant into the oil. This was caused by broken intake manifold gasket. Apparently they're somewhat notorious for developing leaks. That repair required taking the top half of the engine apart.

Not sure where your leak is, or how much it's leaking, but you may want to consider the intake manifold and head gaskets.

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Q: How do you fix an oil leak for a 1995 Oldsmobile Cutlass Supreme We think it's the o-ring but we're not sure please give all suggestions?
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