I have been changing my oil, on my truck, tractor, Gator, the wife's car, daughter, granddaughter cars, a sister in law, niece's and an some neighbors for the last 30 years. I have a car lift which makes it convenient. Nobody has mentioned how they get rid of there oil.
I have the 15 gal plasitc drums that my brother in law used for chemicals on his farm. He takes a drum and or 2 per year to oil his barn cleaner chain. He is seventy and still farming. Ta Da. The remainder, I give to different garages that have oil furnaces. They are very particular about any antifreeze and or water mixed in with the oil. It plays havoc on there furnaces. In a normal year I collect around 4 to 5 barrels.
So much for the above. I wanted to describe a process to remove a rounded over drain plug. Sorry I didn't take any pictures but you should be able to visualize this process.
I had a friend that took his cars to the local quick change for his oil changes. On his last visit they told him they could not change his oil because they could not loosen the drain plug. They said the plug was all rounded off.
It was a Jeep so he then took it to the local Jeep dealer to see what they could do. He said they tried to remove it also but they could not. He said they had the special sockets designed to remove the drain plugs that were rounded over but they did not work. There fix was $1600 for a new oil pan. The oil pan was a plastic pan with a molded in brass and or bronze insert for the drain plug.
I suggested that he bring his vehicle out so we could work on it and to bring with him some hole saws like .62 .68. and .75 dia. and a couple of new drain plugs. If I remember correctly, we used the .62 dia. hole saw, with out the pilot drill. The rounded over hex acts as a pilot for the hole saw. I used one of my battery Dewalt drills on it's slowest speed and with in a couple of minutes had the drain plug out. This particular drain plug had the outer flange with the o-ring face seal. When cutting you need to be very careful to go slow and with light pressure. You don't want to score the brass and or bronze insert. Even before the cutter had gone approx. 2/3's of the way thru the flange of the drain plug, the drain plug made a slight rotation and I stopped there. Using the hole saw relieved the pressure on the flange of the plug. I then walked the plug out by hand. Another Ta Da. Later