FWIW, I have a 99 Yukon with 208,000 miles on it. Doesn't smoke or use oil.
It is my daily driver. Only things I've done to it since new. Alternator, Coolant 'quick connect' failure at
the intake manifold. I had the rear main replaced when I had the tranny rebuilt at 175k miles. Regular oil changes and I only run high octane fuel which I attribute to me not having the normal fuel issues you hear about. I will say at this point on cold mornings I am starting to get a bottom end knock that goes away once the engine reaches temp. It's going to have to get a rebuild soon but I think 200k is great and if you drive it responsibly you should get 200k easily.