Step 1.

Undo the oil fill cap and tilt the mower on its side, once the oil flow slows tip it as shown in the video to make sure as much oil as possible is emptied.

Step 2

Once all the oil is out you can place the mower on a flat surface and start to fill it with oil. When empty they usually take 400-600mls of oil, slowly fill while stopping to check every now and then. For an accurate check pull the start cord a few times first.