Um... Ive been a logger for 10 years on and off. And most of the new chain saws have crome/nika plated cylinders. I run 20-1. I do not mess around on my Tecate. I also run castrol 2 stroke oil. I have heard too much oil is a bad thing. But banshees are at 20-1. I see alot of people buying top end oil. 15-30$ Canadian for a liter. Ive bought motul oil back in the early 2000s and all it did was mess up my motors. I ran 20-1 in a 1983 stock kx 250 motor with its original head gasket for 3 years with no issues with castrol. I use to buy ultramar oil from the gas station. Also this motor was completey tore down right down to tranny shafts in pieces.