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The fuel mixture for a Stihl chain saw is gas and oil.
All Stihl products use a 50:1 mixture
50/1
50-1 on 2cycle engines
50:1
50:1
50-1
50 to 1, using a quality full synthetic oil like Stihl Ultra. Don't skimp on oil. Use the best.
If you use Stihl genuine two stroke mix, then the ratio is 50:1 eg 500ml to 25 litres fuel
what is the oil gas mixture for a ysr50
both... you mix the oil and gas to a 50:1 ratio......it has to be 2 cycle oil though
50:1