Regularly changing engine oil in your lawn mower extends the engine life by providing better lubrication and reducing friction on moving, internal parts. Clean oil carries heat away from hot areas in small engines that function with high-revving and increased operating temperatures. Removing the oil drain plug allows the old oil to drain from the motor so you can replace it. MTD Yard-Man products includes an oil drain tube with lawn mowers to make oil changes faster.
Run the lawn mower engine for a few minutes. This warms the oil and raises sediment from the bottom of the engine.
Park the lawn mower on a flat surface. Turn the engine off and allow the engine to cool for a few minutes. Lift the hood on a riding mower and pull the spark plug wire off the spark plug to protect you from accidental starts. The spark plug is visible on a push mower.
Hold a paper towel in one hand and remove the oil dipstick with the other hand. Wipe the dipstick off with the paper towel and set the dipstick on the paper towel aside. Removing the dipstick allows air to enter the tube and speeds oil drainage.
Snap the small end of the oil drain tube on the oil drain plug. The tube fits underneath the oil drain plug, snaps upward, and is a chute for the oil to drain out of the engine. Place an oil drain pan or other catch basin directly under the larger end of the oil drain tube on the ground.
Turn the oil drain plug counterclockwise, using an adjustable wrench to loosen it, and pull it straight out. Reposition the catch basin or oil drain pan, if needed. Set the drain plug aside.
Replace the oil drain plug and tighten it clockwise with an adjustable wrench after all the oil drains from the crankcase.
Fill the mower with fresh oil and change the oil filter.