Ryobi ZRRY10518 18" 46cc Gas 2 Cycle Chain Saw (Certified Refurbished) Manufacturer Refurbished RYOBI RY10518 18" 46cc Gas Powered 2-Cycle Chain Saw Note: 50:1 Gas to Oil ratio, which is 2.6oz of oil to 1 gallon of gas. Do NOT use E85 gas Pro Grade Chain -- Offers Aggressive Cutting Action 18" Bar and Chain -- Cuts Logs up to 40" in Diameter Inertia Activated Chain Brake -- Stops Chain Automatically