I just bought a gallon of "Dixie Chopper" oil at my local dealership for $27.00. Only bought it because that's what my brother-in-law said he always used in it & I don't like to switch oils. I have always been accustomed to using the same oil in a vehicle (or in this case a mower) for as long as I own it. May not matter, but just what I do. Thanks for all your help fellas. I'll look forward to reading more threads on this site.