I have a Chopper with over 2.5 times as many hours, but I change the oil every 50 hours and grease it every 25 hours. They recommend changing oil at 100 hrs. and grease it at 50 hrs. also, but I fugure oil is cheaper than replacing a motor and grease is cheaper than replacing the bearings. Keep up the good maintenance, some don't do much of anything to their machines and then complain because they fall apart. Your way is good, I figure mine way is twice as good. At least I hope so.