Well my 6800 is in Florida now so mows all year, still at it since 1987, I change the oil every year whether it needs it or not, still looking for the grass catcher attachment to the deck piece, made one out of aluminum but would like to get and original and maybe the tube also. I don't think I will ever part with it, if the engine goes bad I would just rebuild it, but not even any vibration yet, and the deck bearings are still original also. actually only thing I have ever replace since new is the oil filter a bunch of times and the big belt twice...not bad for over 35 years....
gilly