I bought a used zd25, maybe a 2006 serial number 16,xxx. Supposed to have 560 hours on it guy claimed to be trouble free original owner. He bought a new one and most of his stuff was nice and pretty new. With zero records on such a mower I am thinking of changing all fluids and filters to establish a known record. What is the best hydro oil for the job, would prefer kabota brand but looks like they make a couple. Next is there anything else I should be aware of or weary of on this machine. The mower was dirty, in its work clothes. It seems to work fine. Left hydro was a little low on fluid but all fluid looks good, very clean, no smell. My hope it to have a long term mower to maintain around my place 2-3 acres a week. Did I buy the right one, is the zd 25 up to the task. If not I might pass it on next spring and try again. So far the ride does not impress me much. Thanks for any helpful input.