Ideally, your lawn mower's oil should be changed every spring. This keeps your lawn mower in good, working condition throughout the year. It ensures that the engine is properly lubricated, and that new oil is distributed to important mower parts. Changing the oil on your lawn mower is a fairly easy task, and you can do it well without the help of a professional.
- First, clean the area around the oil fill and remove the dipstick.
- Then, locate the oil drain plug. It's usually under the mower's housing, just above the blade. Sometimes, this area is covered with grass clippings, so be ready with a putty knife and a hose to clean this area out.
- To easily access the drain plug, put your mower on top of 2 cinderblocks. Get an old basin and put it under the mower before you remove the drain plug.
- Remove the drain plug by using a socket wrench to twist it counter-clockwise. Make sure that the basin is located directly beneath the drain plug so that it can catch the used oil. Wait until the oil stops dripping from the mower.
- Put the drain plug back on the machine. Sometimes, you may need to replace it with a new drain plug if it is defective. Make sure that you tighten the plug with a wrench before you refill the oil reservoir.
- Replace the used oil with clean SAE 30 engine oil. For two-cycle lawn mower engines, make sure you replace it with a two-cycle oil.
Be sure to check your lawn mower manual for oil recommendations from the manufacturer. Use the dipstick as a guide, and only add oil up to the "full" mark on your dipstick. It usually takes 20 ounces of oil to fill the oil reservoir on most lawnmowers.