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Mystery Oil Leak

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I have a mystery oil leak in my daughter's Escape. I replaced the valve cover seals, the air plenum seals and the PCV valve which showed wear and were leaking oil. It was fine for a while but now it's losing about a quart every 100 miles or so. The only place I see oil is between the valve cover and the thermostat housing. Please see the pictures. Anyone else dealt with this before? Thanks!



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