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I can't say it is a good idea to shift fuels if its not absolutely needed. It creates unneeded risks and work/money. If saw run well on truefuel and has done so, I think it is a better idea to stick to that. Regardless of what fuel you have if it runs well don't change... If not, clean saw...

This with oils is a bit tricky. You can have the right text and numbers on the bottle and it looks ok when you run it. Stihl synthetic is full synthetic. Others can have mineral base and not be up to the temps really... Then you check plug and see its all black, muffler and outlet is full of...

In mixed fuel the oils often have various property's. Like most fully synthetic oils versus mineral oils. Its often not just the fuel that is different. Running gas from station here with mineral oil builds carbon. Change oil to a fully synthetic and it will crawl in under carbon and you cook...