Question about 2000 Jeep Grand Cherokee

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Oil turning black after 800 km. on 2000 in-line 6 Jeep Charokee

The engine is running fine but after about 800 km. the oil begins to turn tar black.

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If your jeep is a diesel it is normal for the oil to turn black, if the jeep is a petrol, then that is not normal, try using engine flush before a oil change, and make sure that you change the oil filter while the sump plug is off, this will make sure that all the oil is drained, the oil filter does have about .75 liters of oil.

Posted on Mar 02, 2009

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Oil pressure loss


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Check gage ligh on..


It could be worn camshaft bearings that is lowering your oil pressure. I had the same situation with my 2000 Jeep Cherokee 6 cyl. Changing the oil pressure sending unit did not make a difference. I used a higher viscosity oil and that prolonged the life for almost another year. If you put an oil pressure gauge on it and let it run at a prolonged normal temperature, it will give you a definite answer wheter or not the engine has low oil pressure. The real problem is finding the cause. Camshaft bearings are a likely source. According to the spec book, the I-6 engine had low oil pressure numbers to begin with.

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