Recommended oil Mercury FourStroke Oil 10W-30Engine protection operator warning system SmartCraft Engine GuardianCompatible with SmartCraft digital technology YesStarting Smart Start ElectricControls Steering Big Tiller Compatible Dual Cable Mechanical Electro-Hydraulic Power Steering Optional on Duals Hydraulic power steeringShaft length 20" / 508 mm 25" / 635 mmGearcase ratio 2.38:1