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No experience in this myself, but read about it on here last night so I thought I shoot this out so you get an answer sooner than later. Seems that a ton of these are coming overtightened from the factory and people are toasting them trying to get them out. They are unique to the car and aren't carried by anyone other than GM at the moment. Your best bet if it isn't ruined already is to get some stuff like liquid wrench or something similar (do a search on the topic to find the exact product), and use that every turn you can...maybe even back it down a couple to get it worked in the threads. You may already need to buy a new one.
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