I have a hobby of working on small engines. The above link is my cheap Troy-Bilt blower/vacuum. It has less than 20 hours on it. Always used Amsoil Saber Pro or Stihl Ultra synthetic 2-Cycle oils at 40:1 ratio. I am not blaming the oil for the problem, but wanted to show that a cheaply made/designed engine will still fail, even with some of the finest oils out there. I don't think any oil can protect against poor engineering, machining, and assembly.