2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 68Get this manual
Bracket unitLower unit NOTE: If the oil is at the correct level, small amount of oil should overflow out of the check hole when the gear oil check screw is removed Change the oil if it appears milky or dirty3If necessary, add sufficient gear oil of the recommended type until it overflows out of the check holeRecommended gear oil: Hypoid gear oil API: GL-4 SAE: 90 4Install new gasket and the gear oil check screw 1, and then tighten the gear oil check screw to the specified torqueGear oil check screw 1: Nm (0.9 kgfm, 6.6 ftlb) S6AG3230
NOTE: If the fluid is at the correct level, small amount of fluid should overflow out of the filler hole when the cap is removed3If necessary, add sufficient fluid of the recommended type until it overflows out of the filler holeRecommended power tilt fluid: ATF Dexron II 4Install new O-ring and the reservoir cap 1, and then tighten the cap to the specified torqueReservoir cap 1: Nm (0.5 kgfm, 3.7 ftlb)