Two gallons is pretty insignificant. And I dont believe Ultra is used in moto mix.I've never had any trouble with "Stihl HP Ultra" full synthetic and I've not seen any evidence it is dirty or has problems.
Redbull661 put two gallons of Stihl mix through a 661 saw on a new piston and cylinder and then did the same for Husky, Echo and Tru-Fuel. No issues with the Stihl in the tear down:
Any of the top tier oils out there from Amsoil, Echo, Husky, Stihl, etc work great. Mix them accordingly and they should work well for you. Some oils are not intended to be mixed at heavy ratios as they may not burn well. For example, I run a synthetic oil in my dirt bike that is designed for a 32:1 mix.
It is insignificant-depending on what you're looking for that is. No one outside of a lab setting is going to run new saws for 500 hours on various formulations to check for predictive patterns.Two gallons is pretty insignificant. And I dont believe Ultra is used in moto mix.
Your right. Most people observations are anecdotal at best.It is insignificant-depending on what you're looking for that is. No one outside of a lab setting is going to run new saws for 500 hours on various formulations to check for predictive patterns.
I see posts online where people say they ran a tank of "XYZ oil" and it was dirty, smoky, ran poorly and clogged their saw, blah blah blah. I think 2 gallons is enough to illustrate that Stihl is capable of producing fuel that isn't a total disaster.
Whether they blend the motomix with the same oil formulation that's available in Stihl Ultra HP I can't say.
People treat oil like a religion when the truth of the matter is that mixing the correct ratio with fresh fuel goes a lot further to giving you years of service rather than the specific brand (among top tier oils). Sure, bargain basement 2T oils are to be avoided, but the top brands all work fine.