Question about 2002 Jeep Grand Cherokee

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2002 jeep grand Cherokee loredo 4.0 straight 6 makes a ticking noise at idle. If motor is revved noise is more pronounced and ticks faster with the revs.I believe that 91 octane gas lessened the noise. I use 5w-30 mobile 1 full synthetic and the thing has almost 130,000 miles on it. This ticking doesn't seem to lessen performance at all

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Richard Welch

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On a high mileage engine you should use 10w 30 NORMAL oil not synthetic.

Posted on Mar 11, 2010

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