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I have never tried the Chevron 75w-90 syntheic, getting ready to change both front and rear soon, thought I would go with the Mobil 1 or the Valvoline syntheic. If you do a lot of towing the book in schedule B section says every 15,000 miles "change". I don't do that much towing so I'll probally go longer on the change. I think just as long as it's serviced the way you use your truck, and use a good syntheic oil you'll be good to go with any of the major brands---Chevron, Mobil 1, Valvoline, etc.