belray gearsaver or type F atf works the best ,nearly every top reputable 2 stroke engine builder in the country uses and recommneds type f atf ,it is used on 25,000 dollar+ drag banshees where every detail matters ,type f has friction modifers,thin yet protects and has a high flash point ,free of dangerous detergent additives like motor oils have . its used in old style fords which are similair to our motorcyle disk trannys.type f shows 10% more torque than other oils on dyno results according to a couple top builders on planet sand .com.it is used so often because it works ,not because its cheap.four poke and 2 stroke lower end oil should not be the same ,they have a different engine design to them and they have different duties like cooling a piston and such