So how quickly or soon should I worry about this? The car has 46k miles on it now, so it's not under warranty.
Obviously "if" I do bring it to the dealer I'll try to put up a stink and see if I can get a goodwill warranty. Is the stealer going to charge me to diagnose something that is already obviously apparent?
Also, if I do decide to fix it, and if I can't get any help from GM, how hard is it to fix myself and how much is the gasket? I'm a pretty decent driveway mechanic, so I think I should be able to change it myself. Is there a "how-to" around here?
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