I was getting started to change my oil, and the plug just would not loosen. The last change was done at a shop, so I figured they must have just over-tightened it so I got out my torque wrench. Then my socket cracked. I couldn't really see the nut from where I was so I took some pictures, and the darn thing doesn't have actually squared off edges. Mind you, I don't mean they're rounded from wear. It's like it's been welded/soldered or something. Any ideas why it's like this or the best way for me to deal with it?

 

Replace that one. Have the new one in hand, and use vice grips to get that one out if you have to.

 

Kinda what I figured, just wanted to check myself before doing something stupid.

 

That's pretty typical of a drain plug that has had a wrench slip, either because it was not the correct size or it was not on completely and straight, or some combination of all that. It could be due to the cracked socket. It's not due to someone having welded or soldered on it. When you get the new drain plug, make sure the wrench/socket you plan to use fits properly before installing the plug. Hint: The correct socket/wrench is mostly likely metric rather than SAE.

-Rod

 

Some d!ckhead used an adjustable wrench on that way too many times. A proper good one is a perfect 13mm.