Warm up your bike to operating temperature, let it idle for at least 3 minutes, then turn the motorcycle off. Let the oil settle for another 5 minutes. Remove. Remove the engine oil drain plug with a 5/8-inch socket. Softails: drain plug is under the right side of the motorcycle's frame, near the rear wheel. Dyna and Touring: oil drain plugs under the transmission housing. Drain the engine oil into an oil pan. Remove the transmission housing's drain plug using a 5/8-inch socket. Softails: drain plug is found between the rear shocks. Dyna and Touring: have drain plugs under the left side of the engine's oil pan. Remove the filler plug from the left side of the transmission using a 3/8-inch Allen wrench. Remove the oil filter from the front of the engine using an oil filter wrench. Drain any oil into your oil pan. Remove the primary housing's drain plug, beneath the round clutch inspection cover on the left side of the engine using a T40 Torx driver. Drain the primary's fluid into oil pan. Replace. Replace the drain plug's O-ring, then screw it into place after the oil has drained. Tighten the drain plug to 18 foot-pounds with a torque wrench. Replace oil filter with 20W50 motorcycle oil then screw it onto the engine by hand and tighten the oil filter an additional 3/4 turn. Replace the drain plug's O-ring, then screw it into place after the oil has drained. Tighten the drain plug to 18 foot-pounds with a torque wrench. Unscrew all five bolts from the primary housing's clutch inspection cover with a T27 Torx driver. Pull the cover and its gasket away from the primary housing. Replace the drain plug's O-ring, then screw the drain plug into the primary housing with a T40 Torx driver. Tighten the drain plug to 6 foot-pounds with a torque wrench. Refill. Refill the primary housing with 32 oz. of Harley-Davidson primary fluid. Reinstall the clutch inspection cover and its gasket onto the primary housing, using a T27 Torx driver. Refill the transmission with 24 oz. of Harley-Davidson transmission fluid, using a funnel. Screw the filler plug into the transmission with a 3/8-inch Allen wrench. Tighten the filler plug to 50 inch-pounds with a torque wrench. Pull the filler cap out of the oil tank. Refill the oil tank with 3 1/2 quarts of motorcycle oil. Reinstall the filler cap.