My experience with the Amsoil Saber at 100:1 is a bit different. Yes the engines ran well, they just didn't run long. My first DA 150 I got second hand, the original owner was running 100:1 so that is what I continued to run. After a few months the engine started to behave erratic at idle and was sent it to DA. It came back with new bearings and crankshaft and a recommendation to stop using 100:1. Since then I have used 50:1 either Penzoil air cooled or Sthil HP Ultra.