It is relatively easy to change the oil in your push mower. For the example a Troy Built, Briggs and Stratton engine was used. Not all lawn mowers are the same, but most of the procedures are the same. Always consult the owner’s manual for your mower. Most manufactures recommended that you change the oil after 50 hours of use or annually.
First you need to gather a few supplies. You will need newspaper, a shop towel or rag to wipe up any excess oil, a funnel, an oil drain pan or some type of container to hold the used oil, and a container like a plastic milk jug for temporary storage of the used oil for disposal. You will also need 18 ounces of small engine oil. SAE 30 oil or a synthetic 5w 30 4-cycle small engine Oil is recommended, and is available at almost all home improvement and auto supplies stores everywhere.
It is recommended that you run the mower for about 2 to 3 minutes first to allow the oil to circulate and warm up so that it is less viscous and will flow more easily. Next, stop the mower and remove the spark plug wire. This is for safety purposes. Then you will need to spread an adequate amount of newspaper on the ground to collect any excess oil that may drip.
For safety purposes, ensure that you drain the fuel tank. You can either let the gas run out while you are mowing or siphon it out so that gas does not spill out of the breather hole in the cap.
Wipe around the oil filler cap with a clean cloth or paper towel to remove the dirt and grime that has likely collected there. The oil filler is located on top of the shroud. There will be a dipstick attached to it.
Place you drain pan under the oil filler cap before removing the cap. Always tip the push mower towards the direction of the dipstick tube or drain hole. If you tip it the other way, you will allow the oil and particles to enter areas of the engine where damage to the engine can be done. Rest the mower...