Place a drip pan or other container on the side of the mower with the filler. Carefully tilt the mower so oil drains out and into the pan. Discard the spent oil into a proper disposal vessel. Now slowly pour fresh oil into the mower. For the specific type of oil you need check your instruction manual. Make sure to add only as much as your particular model requires. Remember to let the mower sit undisturbed for a few minutes so the oil settles properly inside the engine.
Other buyers comment that the mower feels and look like a toy. It seems flimsy. But they also found it could handle child-swallowing yard growth. One of the coolest features of the Toro Recycler 22-inch Personal Pace Variable Speed Gas Walk Behind Self Propelled Lawn Mower that kept coming up in our research is the blade-brake clutch. This allows you to stop the blade without stopping the motor of the mower which is helpful for moving debris out of the way.
Consumer Reports recommends the Toro Recycler 20333 because of its very good ratings in ease of use handling side discharging and bagging and excellent mulching. The reviewer specifically liked the washout port for cleaning buildup under the sizable deck. The Wirecutter used to list the 20333 as the runner-up pick but supplanted it with the 20340 because of the newer models upright storage. However the reviewer still recommends the 20333 if the blade brake clutch is more important to you than compact storage.