Hello it depends on the age of the chain saw new ones with 2mix engineswill run on it older ones don't like it as it's petroleum distillate there's no ethanol or other fuel additives in it except 2 stroke oil did the dealer tell you the price £21.00for 5 litres with oil in it £18.00 for 4 stroke I have a 2017 .ower with a 10.5 up engine it won't run on aspen or bio petrol made from wheat ,as long as you use a funnel with a filter in it and change the filter at least once a year it should be ok jezza