Thanks guys. The tractor appears to be well maintained; the oil doesn’t seem especially dirty for a diesel, the filters are all OEM Kubota, and it’s got a newer interstate battery. I asked the seller for any service records or receipts and he didn’t have any, but says it was maintained according to the operators manual. He says he did a 50 hour service and a 200 hour service. Next major service is 400 hours. It now has 248 hours on it. Keep in mid this is a 10 year old tractor, so even if he serviced it at 200 hours that was probably 2 years ago. I think I’m going to do a full fluid and filter change just for my peace of mind. Am I being paranoid or should I go with my gut and service it now?