Ran into this while doing an oil change, why is this like this? Why is there a chunk of thread missing? Vehicle is a 2019 Buick Cascada. Based on the look of things, At one point before it came to me the threads got cross-threaded or stripped, there was an attempt to retap and rethread the hole. There was a HeliCoil installed, And it came out while I was removing the drain plug.
Yes, I'm quite certain it did.
Interesting ๐ค I've seen some with drain holes in the threads, but this is the first one I've seen with such an excessive cutaway.