You can buy the correct type of oil for the same price as supertech..Might be more fuel related than oil. According to some of the finest builders here. I've seen the results of our (n mich) pump gas and super tech tcw3 in 8 - 27 year old saws. Piston tops are black with arrow still visible and .005 - .010" carbon layer in the exhaust port. Not too bad for buying a new saw every 2 years from money saved on buying fancy oil.