Sport_Pilot,

I don't know where you get that most engines outlast OS. I still have the OS45FSR that I learned to fly with in 1983 and it runs fine. As a matter of fact it was stored for a few years when I moved and recently I dug it out and mounted it on my original Midwest Sweet Stik. I made a comment to one of my buddies that I hoped it would start after all those years.........well the starter didn't even turn over one time and the engine started and away she went. OS goes the distance...........PERIOD!