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.

  • TragicNotCute
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    117 months ago

    I don’t know, but if I give a wrong answer, you should get a better right answer from someone else.

    I googled it and this is what I found:

    Looks like it’s at the low point in the pan to make the drainage more complete.

    • littleblue✨
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      -17 months ago

      IANAM, but it took one glance at the photo to know why there was a drainage route through the threading: um, drainage.