Homelite Refurbished UT10588 18" Bar Gas 42cc 2 Hp 2 Cycle Chain Saw Tree Home Chainsaw 50:1 Gas to Oil ratio, which is 2.6oz of oil to 1 gallon of gas. Do NOT use E85 gas Power tool offers power, reliability, and endurance to any tree feller 2 Cycle gas powered chain saw Engine Type: 42cc 2-cycle Gas Gas Mixture: 40:1 Gas/Oil ratio