Rislone 2-Cycle Engine Oil from Bar's Products keeps two-cycle engines clean, reduces smoke emissions and eliminates the need to keep track of multiple gas cans. This formula improves engine lubrication and prevents ring sticking. Works effectively in equipment requiring 32:1, 40:1 or 50:1 gas:oil ratios. Rislone 2-Cycle Engine Oil is sold in a 3.5 oz. bottle, No. 40003, to treat one gallon of gas, and in an 8 oz. size, No. 40008, to treat 2.5 gallons of gas.