Well kind of, Stihl recommends that you need to use their synthetic oil to keep the carbon build up off the valves. Up until last year I ran Echo, Redmax and Stihl mix, it just depended what the dealer had cheaper by the case at the time. BTW echo and redmax are the same oil. Last year I changed to Amsoil and have been very pleased. I bought my first 4 mix in 2005 and it is still running, but I still prefer the fs 80/85 twice banger.