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I haven't yet done any maintenance to my SC yet, but really should. I only know what I have read for SC maintenenace and that is really just change oil every 30k miles. As far as life expectancy goes, a guy at one of GMs dealerships told me that the SC usually tends to go out around 80 - 120k miles. I would assume this maybe if you didn't properly maintain it. My car right now has about 115k miles on it and have no problems what so ever from the SC, and according to car fax there hasn't been any maintenance to it as far as it knows, previous owner of the car was an older guy prolly in his 50's or 60's.
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