The chemical plant that I work for uses Royal Purple everywhere. They make an outstanding product. It's pricey, but I think it would end up paying for itself in the long run. I myself have seen demonstrations that the Royal Purple rep. put on here at the plant, and it's a very protective lubricant. He filled a cut away gearbox with gearbox lube, then drained it, and ran it dry while applying force to the gears and it never smoked, sparked, or broke down verses the other lubricant that we had been using which failed in 15 minutes. I have had no personal experience using Royal Purple products, but there are several members of a Nissan Titan forum that I am a member of that live by their products. Here's a link to Royal Purple's website for further information:
Royal Purple Consumer Products