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Royal Purple
I have run Royal Purple in my Envoy and Dodge Ram 2500 for 7 years with great results. I go 5-7 k between oil changes and have got from 3-5 miles per gallon increase. I also run it in the tranny and rear end along with over sized pans to help with the desert heat. I tried Lucas and Mobile One but did not get the same fuel milage. I love Royal Purple.
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