My son has a one year old Bobcat MT85 mini track loader that gets regular use and abuse in his business. It has a Kubota 3 cylinder diesel engine, 24.8 HP. His Bobcat dealer did the first OC at 50 hours, like the owners manual says. But the dealer insists that the next OCI is 500 hours. The manual says 100 hour intervals are recommended but can be extended with use of synthetic engine oil. I have not talked to the dealer, but both the service writer and the shop's mechanic insist on 500 hours as the next service. Any Bobcat owner/operators out there with opinions on this?