Eng Center Pipes

Need to change oil in my briggs eng. model no.303777, it is on a Snapper lawn mower Please help?
It has a plug on left side of motor, but will have to remove tire to use it .Someone told us that the round pipe comeing out of the motor on the lower back center was also a place to drain the oil. But if so we don't know how to use it. Would appreciate any help. Thank You
Do you have the book?
1- You shouldn't need to remove the wheel, but doing that isn't hard.
2- The wrench you need depends on if the plug is hexagon or square.
3- Set the mower on a pan to catch the oil.
4- Make sure you practice loosening and tightening the drain plug before you start.
5- When you are ready, run the mower engine for about 15 or 20 minutes so that the oil is hot and can drain more quickly.
6- Put it where you are going to change the oil and open the drain plug, (the plug will fall into the oil and the oil will splash all around anyway).
7- When it stops dripping , put the plug back in and put in the fresh oil in.
8- OR take it to a garage or mower shop and let them do it (and or show you how by letting you watch how they do it).
9- Good Luck!
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