I have over 200k on mine and its 99 percent original.. I used the mobil 1 oils, and serviced everything like i should on time.. bought gas at newer gas stations in town. I use it to tow full size trucks and boats around with out a prob.. it could use a little more ummphh behind it.. but in respect most of what i tow equals over 10k lbs.
I sell parts and work on cars for a living.. and it seems I have found those that only change the oil in the engine.. and neglect everything else seem to be the ones have the issues with trans missions and alternators..
same with any car the better you maintain it, the longer it will last.. and for my tahoe i do not plan to get rid of it. Its done me good
I love the view.. its easy to see out of with less blind spots compared to most full size suvs
I have an spectre intake, would preferr a k&n. and also have a trottle body spacer "be carefull installing" most people end up with a vacuum leak afterward.. both have inproved my gas mileage.. and run 20x10 rims with a decent size side wall.. which has greatly improved traction when towing, stopping, and the handling improved the most.. body roll went to a minimum.
this web would allow me to mark one with a 5.3l 4x4