How do I properly maintain my Craftsman lawn mower by changing the oil?

To properly maintain your Craftsman lawn mower by changing the oil, follow these steps:

1. Locate the oil drain plug underneath the mower.
2. Place a container under the plug to catch the old oil.
3. Remove the plug and drain the old oil into the container.
4. Replace the drain plug securely.
5. Remove the oil fill cap and refill with the recommended oil type and amount.
6. Check the oil level using the dipstick and adjust if necessary.
7. Start the mower and let it run for a few minutes to circulate the new oil.
8. Check for any leaks and ensure the oil level is correct before using the mower.