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Why does fuel leak into the oil of a 1990 jeep wrangler?

Updated: 8/20/2019
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10y ago

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Misfire due to spark plugs, wires, internal engine, stuck injector, etc. Basically anything that would cause extra fuel in the cylinder or anything that would prevent the fuel from burning.

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Q: Why does fuel leak into the oil of a 1990 jeep wrangler?
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