That tractor looks almost identical to one that I was given earlier this year. I don't know the age, but it has the 11 hp B&S as you describe. Mine starts right up and cuts 2.5 acres about every other week. How did you determine the age of yours?
Guess what N.A.S.A. uses. Synthetic? Nope, whale oil, that's right, whale oil.Synthetic oil is always better than conventional. Anyone who says different just doesn't know what they're talking about.