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This makes the 3rd one I have done. First was a Jeep Wrangler with a front to back engine like this Grand Cherokee. The second one was a Cherokee 3.2 transverse engine and that is easier. Did that one in 3.5 hours. The Penstar 3.2 and 3.6 engines are all known for the oil and coolant leaks at the plastic oil cooler/filter housings. Knock sensors are right under the housing. I always change them while I am in there. Takes all of 10 minutes to do that.nice work, 4.5hrs sounds a lot faster than if i was doing it, haha.