I bought a 350 hr IZ4818 this winter. I haven't cut grass with it at all, so I don't know, if it going to fly apart. I have changed the hydro oil and new OEM filter for it. I've adjusted the valves to .005 it has 18 hp Kawasaki in it. I've sharpen the blades a balanced them, so I think that I am ready. It starts and runs good, no smoke. My question is, I only cut 1 acre, and would be good thing to add an oil cooler, for the hydro. oil are, it should be alright. I am keeping my 1864 cub cadet for back-up for awhile just in case I don't like this mower. I didn't know why they don't still have IZ commercial grade anymore. It is in great shape, and build a lot better than my cub. Can't wait to cut grass with it. THX