500 hours on an oil filter change?
The commercial engines used on golf course equipment call for oil filter changes from as low as 50 hours on small gasoline engine powered equipment to a maximum of 250 hours on larger diesel engine powered equipment that hold many gallons of engine oil.
Most commercial engine manufacturers recommend engine oil changes at 90 day intervals regardless of engine hours.
Learn something new everyday I guess.
Of course this is just my humble but well thought out opinion.