Just no to the Stihl silver bottle. I happen to use Echo Red Armor mixing oil but there are many oils better than the overpriced silver bottle from Stihl. if you want reasons not to use the Stihl oil, just search the internet. I don't have the time to type it all out. I own and use both Stihl and Echo power equipment. More Stihl than Echo machines. Stihl's corporate silliness caused me to switch to Echo.