Just curious, what kind of oil where you using and at what ratio? I'm not trying to imply anything, just gathering info to make an informed decision. I'm using Amsoil at 80:1 to 100:1 and I have already decided to change oils. I may just go back to my Poulan Chainsaw oil at 40:1 the pre-measured cup built into the bottle makes it so easy to mix the gas. Although any oil with castor will make an engine more resistant to "sticking a piston" I think it makes more carbon. Trying to figure out what synthetic I should use. I might see if Penzoil air cooled is available locally and just run it at 32:1