Remember the old warning -- don't run a synthetic oil until the rings are seated !! Wonder if it holds true for saws ?? What I couldn't understand about that statement was for example the chev. corvette they say comes from the factory with synthetic oil already in the vehicle . Supposedly the synthetic oil is to slippery to let the rings seat ?????????? I figured I run the 6-pak of husky oil through it and then decide whether to try and find the husky XP or go to the Amsoil brand . I run Amsoil in other engines and equipment but the one thing I like about the better chainsaw co. oils is that they do add a fuel stabilizer to there oils , not sure if Amsoil does this .