I have multiple two stroke engines. The Macullogh chain saw, echo weed eater, stihl blower. If I only wanted to use one oil for everything what would it be. I just bought echo oil, cause it is semi synthetic and the stihl oil does not state that. I previously used homelite exact mix with good results, but I don't think I want to use that in the brand new stihl. I run everything at 50:1. WHAT DO YOU USE that you are happy with and what ratio?