I just bought a Husqvarna 35....for an ironic $35. It is the 300 anniversary edition. It is in emaculate condition, and runs really good. I know the 35 calls for a 25:1 ratio. I also have a Stihl FD80 that calls for a 50:1 ratio. The guy I bought it from recommended that I use either non detergent sae 30, or TC-W3 2 stroke oil for my 25:1 mix...He told me not to use modern 2 stroke oil. My main question would be...If I did use either oil that the guy recommended, how will this affect my FS 80? I really don't want to have to have two mix cans, I won't be using the saw enough to justify it. I am really hoping for the " she'll be a smoker" answer, but if I must have separate mix cans, then so be it.