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I would comment though that few stock engines need a high volume oil pump. Just more parasitic horsepower loss and more wear on the cam gear.
My usage for this truck isnt easy. It doesnt get used much (93K miles since I bough it new), but I tow my near 9000lb travel trailer and a 24' enclosed car trailer with whatever fits inside. So it is working pretty hard most times in 3rd gear (3.92 gears). I was wondering if oiling was any contributing factor.
If any towing trip did it, it was our cross country Grand Tetons and Yellowstone trip. My truck was sucking wind up the Rockies. And I think I already had my burnt exhaust valve at that time, just not occurring as often.
