I have a Scag Cheetah 2011. It has a 31HP Kawasaki motor, 61" cut. So far I love it. I mow about 2 1/2 acres in 1 1/2 hours. I use Valvoline 10W30 Dino oil but next year I think I will go synthetic. I did my first oil change & it seemed to run quieter afterwards. One thing the original oil filter was on so tight I destroyed it (twisted) getting it off. I replaced it with a WIX. The old & the new filter looked identical, so they might of both been WIX. If anyone has any comments about the Cheetahs I'd like to here them. Oh yes it rides like a Cadillac.