I am yet to see any evidence high priced synthetics perform or protect any better than the oils OEM's have been specifying for decades. OEM's know a thing or two about what oil to run in their products (despite what many may believe). Stihl Ultra was introduced as four mix engines have valves, not because it offered better performance/protection in saws. For years I have stated this in oil threads and the majority of folks simply refuse to believe there is any sense in my statements. Quite funny how things eventually change, people usually work things out given enough time. Reading oil threads reminded me of banging your head against a wall day in day out and wondering why you had a headache!lol And if you don't like stink and tuning issues, don't run synthetic,its really that simple. There is absolutely nothing wrong with a quality FB rated mineral oil in a saw, try it yourself!