what oil do you use now?
if a 10-30 I'd go to a 15w40
or.. just add oil at 10 hrs.... if you use it 50hrs a year.. that's 5 quarts...
5qts a year is an oil change.
slap a new filter on it each year and you got a continual oil change going.. :)
walmart quarts of oil are less then 3$ or gallons are less than 13$