Is it a T800? A landscaping company I used to do some side work for had one with a C12 and they pounded the heck out of it with no issues. Had more hours on it than miles. I've heard from other people it's a throw away engine but I don't have enough experience to corroborate that. As for the old super 10 I've heard mixed things. Probably just as reliable as a normal 10 speed
Super 10 is ok, I liked the transmission, some hated it. C12 isn’t bad, no powerhouse but it’ll do a job