Bolens push lawn mowers will either have a drain plug underneath the mower deck or the mower has to be tipped on its side so the oil can be drained out of the top of the mower. However, the first thing to do is to remove the spark plug wire from the spark plug before you start working on the push lawn mower.
Most push lawn mowers do not have an oil drain plug, but if yours does prop the lawn mower up on something so you can have access under the deck. The drain plug will have a square head so you can use a wrench to remove it. Once the drain plug is removed, oil will pour out so make sure you have a drain pan ready. If the mower does not have a drain plug then remove the oil cap from the top of the push lawn mower and tip the mower on its side. Always tip it away from the side that the air filter is on otherwise oil will drain into the cylinder and air filter causing your lawn mower not to start. Allow the oil to drain into a drain pan for a couple of minutes. Reinstall the drain plug, if equipped, and fill the lawn mower with the correct oil only to the full line on the dipstick. Donâ€™t forget to seal the oil cap on tightly.
You can find the model and serial numbers located on your Bolens push or self-propelled lawnmower either on the deck, or on the rear door if you have a rear discharge unit.
NOTE: if you need a part for the small engine in your Bolens push or self-propelled lawnmower, there will be a separate model/serial number for the engine. Here are the small engines that are available in your Bolens push or self-propelled mower. Visit the page of the engine you have to find out where the model/serial number is located for your small engine model: