How much should this service cost reasonably? The dealer in my area charges around $400. Which I believe is ridiculous. All they do is check this and check that, the only they really do is rotate the tires, change the oil filter and oil, lube some parts, and rip customers off. If I go to a mechanic, what kind of certification should I look for? and will this void the warranty? Any kind of help would be appreciated. Thanks!!

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