I've had my G6 since January and its got almost 20k miles on it. I have had my fair share of problems but for the most part its been great. The major problem is the car doesnt start right most of the time and when you hit 5000+ RPMs the engine screams, literally. Everything else was just small stuff that either got fixed at the dealership or just went away on its own. They need different tires or something, i went to the dealership and they told me the tires need to be replaced within 10k miles, somethings up with that. Anyways the car is a blast to drive, its got every option but the bigger sunroof. Its go really crappy gas milage i found out, im lucky if i get 20mpg.
Auto with Manual, sunroof, heated leather seats, onstar/xm radio, 17 chrometech wheels, great in the snow, just remember to turn the TC off.
Better tires, do something about that plastic piece on the bottom of the front of the car, had to replace that 3 times already.
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