thanks all, what an amount of great info. will a 4 stroke last if i constantly mow a lawn that is on a 45 dergree angle. wont the oil sit on one side and the other side heat up?. Another question, if 2 strokes are being fazed out, i have a backyard with 53 2 strokes am i sitting on a gold mine. if so i will try not to break anymore. sean