Just for what it's worth.......GM has a sealant/thread locking compound on that fitting..........chances are that you will have some thread damage after removing that plug....(ask me how I know.....LOL).....It is a special Metric thread.......I had a Tap made for that thread.........If you need it let me know and I will send it to you to clean out the threads...........Just return it when done as it seems to make the rounds to help everyone out.......
Ken
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