Originally Posted By: AirgunSavant
Looks like you took it to the limit.
Dusty means severe service-right?
My daily commute is 45 miles of highway at 90mph, 25 miles of two lane at 70 and 5 miles of extremley dusty dirt roads. I do this 15 shifts per month and many times in 4wd for the entire trip albeit a bit slower. Then when I am off I use the truck for hunting alot and its a 60/40 mix of dirt to paved. The truck is very well maintained, but I would say these are definitely severe conditions.
I wonder if I would be better of qith Mobil 1 EP, which is what I ran from new, at a 15k drain given the dirt and the obvious increase in wear metals. Or maybe just go back to conventional oil at 7500.