I have been running Opti2 in all my 2 smokers now for the last 4 years, weed wackers, chainsaws, and the cheap built 2 smoker engines on my three motorized bicycles, I have not had one single engine failure since switching for the normal dino oil to Opti2, all my engine start easy, run clean, perform very well and have been perfectly reliable on Opti2, thank you interlube for such an excellent product, people that’s doubt or have not yet heard of Opti2, have no odea hat a great product they’re missing out on, I plan to switch all my 4 smoker lawn and garden equipment over to Opti4 this spring also…. excellent product……! Im a lifer when it comes to Opti2 qnd other Interlube products period.