I run Amsoil in all my vehicles & motorcycles (motor, primary and gear oil). Haven't used it on any of my PW equipment, yet.
On my trucks, I get 25,000 between oil changes, and when I drop the oil it's still like honey.
Great info Russ, you never break in a motor with Synthetic. Dino oil for the first 1000 miles on my motorcycles, 10,000 on my Duramax. Synthetic is too slippery for breaking in a motor. On my bikes, when new, I drop the original dino oil at 100 miles (you'd be surprised at all the metal shavings), replace with dino oil, change again at 500, the 1000. Switch to Amsoil at 1000. Change every 5000 miles.
You can purchase Amsoil at wholesale cost. Contact a distributer in your area and have him set you up as a dealer/distributor.
Dino oil and a filter is cheap, compared to the damage you can cause your motor after the viscosity breaks down.