Aside from how to operate things, correct break-in and early first oil changes can really help with longevity.
I tend to overkill, bringing new vehicles home on a trailer, then putting them on the lift to check fluid levels (which are rarely correct) and install magnetic level plugs wherever possible.
Next is the diff gear break-in, following gear manufacturers' guidelines. With those first painful 100 miles done, and the brakes properly bedded in, I switch to the vehicle manufacturer's recommended break-in.
Before that's over they get a first oil change at 500 or so miles, and new diff fluid. The latter has saved a couple of diffs from an early demise.
Well, you get the idea, I treat them all as forever-vehicles, which they never end up being. Heck, I've sold several with under 1,000 miles on them.
