Question about 1989 Jeep Cherokee

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Jeep 99 grand cheorkee limited

More oil is needed every 500 mile- using a lot of oil.
what grade should I use.
I have over 200k miles on the car?

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  • Contributor
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Is it leaking at the rear of the engine if so try getting a rear main seal, but make sure it is 1 piece or 2 pieces.

Posted on Feb 02, 2009

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First, correct any leaks on outside of engine. You would be surprised how much oil a drip can use up! If you have a 4.0 engine, make sure the valve cover isn't leaking. They use a plastic valve cover on these and sometimes in cold weather, they need to be re-tightened a bit. DON'T pull down too ******* these... the fasteners are small and WILL break if you really crank down on them!!!
Second, how much smoke is coming out of the tailpipe??? Use a good quality 10w30 oil, add marvel oil in place of one qt of engine oil... it will help clean insides. In an older engine, that "high mileage oil" is a good idea. It contains mild seal swelling additives that should slow down crank seal leaks somewhat.
Clean out the vent assembly that replaces the PCV valve. if clogged, it can force oil into the combustion chambers past valve guides and rings.
At 200K, you have to expect some extra oil consumption but if this happened all of a sudden it is likely from one or more of the above conditions!
Good Luck!!

Posted on Dec 29, 2008

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