Put this in my Cub Cadet Edger AND my Stihl pressure washer a few weeks ago. It quietened down my pressure washer so much I thought something was wrong with it. And when I pulled the trigger on the wand I noticed it doesn't pull the RPM's down near as much as it did which tells me it has more lubricity than my old oil! No, it's not snake oil but it's good stuff.
This oil is amazing for keeping older 4 cycle engines alive. I'm sure it's great in new engines also, but if you don't want to have to keep replacing your power equipment every 3 to 5 years, just use this instead. I use this in my 15 year old lawn tractor, and my 10 year old snowblower. By the time the wheels rust off of them and they are no longer usable, the engines will still be going strong thanks to AMSOIL.