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Oil blow by is common as the Jeep ages. One thing to help that is to remove the valve cover and thourghly clean it out along with the rubber gomets and hose or ptubing that attaches to it. You might need to replace the grommets the checkl your air box and make sure it is clean as well

The Catalytic Converter is bad (clogged). Loss of power the hotter it runs? Its creating back pressure do to the clogging.

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Q: Why does your 1986 Jeep Comanche keep pushing oil out of the engine?
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