You may want to use a funnel to help avoid spills on this step.

Pack a clean paper towel below the oil filler hole on the valve cover to catch any oil that might spill.

Fill the engine up with 4.5 Quarts of oil. The M20 engine uses 20W-50 conventional oil.

After you've filled the oil, wipe up any spills with your towel.

Reinstall the oil filler cap.