I have an Exmark Z HP with a little over 500 hrs on it, and had to have the spindles replaced. They were the sealed type, which required "no maintenance." I was told by the shop that nothing was unusual about that, but I think that was very poor longevity. The fellow I talked to at the shop, when pinned down, said he preferred greasable spindles although they do require attention. I have had more than my share of problems with the Exmark and plan to move on now. I need more machine anyway, and have looked at the Hustler Super Z 72" diesel, and the Ferris 5000is 72" diesel. The Hustler has sealed spindles, and I forget about the Ferris spindles. Any thoughts from the experienced here on the relative merits of the two types, and if there are any on the market with greasable spindles in that range of machine?