JD makes several types of commercial mowers, however the 455 diesel isn't one of them. The 9 series for instance (911, 930, 932, 935, etc. are larger mowers that are commercial. These are impressive machines but they don't leave a very nice cut. Shabby in fact. JD also has a mid mount Z mower out this year but like much of their other equipment, it's not made by JD. This happens to be MTD in fact. Good luck with your shopping! Also, Andrew, Why not a Kohler motor? Are you one of those that had valve or lifter trouble too? ( I know there was alot of that between the time they switched to the Command motors and '99). <br><p><font size="1">Edited by: Runner