Red Armor Fuel Treatment is an ideal solution for day to day or long term needs for all your outdoor power equipment including: 2-stroke, 4-stroke, mix-lubricated and EFI (Electronic Fuel Injection) engines. When using pump gasoline, you should always mix in 2-stroke oil according to instructions prior to use, to maintain the units engine and performance. Red Armor Fuel Treatment works in conjunction with your 2-stroke oil in 2-stroke outdoor power equipment to enhance fuel stabilization and extend fuel life even further.