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I have a 98 Grand Cherokee 5.9L V8. it has 70,000 miles on it and I'm currently in the cleaning phase of Auto Rx. After that is completed I wanted to switch to synthetic (Probably Mobil 1 or Royal Purple?) I generally drive it to/from work mostly highway about 20 miles each way. Sometimes I...

I see a lot of people like Havoline oil. I was wondering if everyone was referring to Havoline synthetic or dino Havoline? Also I see they have a high mileage oil; there are a lot of companies that are advertising Hi-Mileage oils. I had used Quaker State HM for some time in my Grand Cherokee...