Just send in a fluid sample for analysis and there isn't any guessing. By doing this I found out in my Titan I could go 13,000 miles between oil changes using Mobil1 extended, sure beat the heck out of 3000 mile changes when you drive over 4000 miles a month most of the time. I also sent in a sample of my tranny fluid at 60,000 miles and they found no problems with it and I'm now at 115,000 miles and will send another sample in at 120,000.
As for this truck, I just went over 40,000 miles in my 3500 and plan to do the same thing when I hit 60,000 miles.
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