Change the oil on an MTD Yard Machine riding mower by removing the drain plug and directing the used oil into a collection container. If the mower has a spin-on oil filter, change it when changing the oil. Replace the plug and add the appropriate amount of oil.
While most mowers allow easy access to the drain plug, which is normally located at the bottom of the fill tube, some have equipment that prevents opening the plug. For these mowers, an oil siphon pump makes the oil change easier. Place the suction hose into the oil reservoir through the fill port, start the pump and allow it to remove all the oil. Then proceed with the change as normal.
Users achieve better oil changes when beginning with the machine still warm after its operation. The oil drains more readily and debris is evenly dispersed throughout the oil volume. Ideally, owners should change the oil after the first 5 hours of operating time for the initial break-in period and then after every 50 hours operating time, or at least once per mowing season.
After refilling the oil in the mower, check the level on the dipstick. It should be within the normal range. If it is below normal, add more oil but avoid overfilling the machine.