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Q: oil in coolant on 2004 Lincoln LS

does this mean the oil cooler is bad
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Yes, it seems to be a common problem on this engine. For diagnostic purpose I usually bypass the oil cooler from the cooling hoses and you can see oil dripping out from the cooler. Since the oil pressure is higher than the cooling system pressure, oil is pushed into the radiator.
Get the oil cooler replaced and the cooling system flushed - it may need to be performed several times and a non-foaming detergent could be a big help to get rid of the oil from the cooling system.

Zee
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