I don't understand? I bought a 1998 John deere 790 new, I am on my second set of tires and seat springs, that's it. Bought a second used same year twenty years ago same deal, new tires and seat spring which to be honest is a plastic rubber spring like thing I will eventually replace with a real spring buy that is it. I have never seen my JD dealer since. Never had a reason to. Two solid simple diesel yanmar tractors that I just forgot have a new ten year old battery never fail to start, operate and have any issues. Tires, batteries and filters are universal, the seat spring thing maybe a JD item but any competent person could find a work around. Tractors should not be like cars. The stealership is not your friend and should not be a necessity. Buy smarter, buy better, pay once, cry once. There is a reason you lease a BMW or Mercedes, they are designed to fail, you buy Toyota or Honda to keep and pass on. Tractors are the same. Visit several dealers, go to the independent review sites. They are tractors, big tools and as such look at their build and weak points. Small axle housing on kiotis, gimmicky electronics that are proprietary, weird filters, unique engines without history of years or models. Think about the brands that came and went, why? Avoid them. The EV crap they are pushing are disposable because the unique battery will cost more to replace than new in a few years. At 70 he should know this. Find the right dealer ? That is the least important thing of all. If you have a warranty issue with a tractor DUMP THAT POS ASAP, because it was the manufacturer, engineer, supplier, designer that are the problem. The dealer is just a middleman with maybe a few manual readers and parts bomb replacers. Want a happy life, never buy crappy made things.