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Take it in, say "I'm pretty sure I have a lower intake manifold gasket leak, could you have a mechanic come out here when he has a minute and quick look at it?" They shouldn't have a problem doing that. Point on the stains, tell about the low coolant incident. Tell them you know it's a common problem, and you'd like to take care of it before it gets much worse. They should agree with you that that's your problem.
Then be nice about it, but say you know it's a problem, and with your mileage, you really don't think you should have to pay for all of it. See if they offer goodwill money. If not, ask really nicely if that's something they can do for you. If they say no, call GM at 1-800-442-OLDS and ask them for money. They'll want you to have had your car serviced at the dealer in the past.
Good luck!
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