I have over 155,000 miles on the truck and all I've ever used is Royal Purple with a K&N filter. I've never had any problems and I drive my truck alot and hard. I travel 130 miles a day just to work and back home (150 with errands and lunch break). because of the milage I put on the truck, I change my oil every first paycheck of the month.
I'm also running royal purple in the rear end. Good stuff!
and Amsoil filters. I bought a case of these when I got the truck. They are the oversized filters and I have never had any problems with them. I got 130,000+ miles out of my 1st D and she purred like a kitten when I traded her in for my 2003. :drive:
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