Make sure you get a full diagnostic on it. I had a headgasket issue at 150k miles. The repair cost more than the car. Ended up scrapping it. It was a fun and a snappy car when it was running at 100%. The massive fuel tank took me from texas to Wisconsin on 2.5 fuel trips. Since i dont know squat about the mechanical upkeep of cars i ended up getting rid of it. However if you are mechanically inclined, this vehicle whouldve had easily another 100k on it. Only if you baby it (i still let the car rip on highways in the middle of nowhere).
I bought my G35 used with only 12k miles and now it has 101k. I love the design of the G35, both inside and out. The interior is very classy and sleek. I think the later updates like the G37 lost some of the good looks. The performance is fun, and though the car feels heavy on the road, it's fun to drive, and the engine sound is great. It jumps off the line, but the AT shifting isn't the smoothest. I've been disappointed by the gas mileage, often around 16mpg in the city and 24 on the highway. With climate change out of control and oil companies controlling our government, I hate giving money to those sociopaths. My next car will be electric. You can't rotate the tires, so they don't last super long. It has some serious blind spots you need to be aware of. And there are a few problem areas that pop up - control arm bushings go bad, brakes don't last too long and tend to squeal, a bad cam shaft sensor recently made my car die on the freeway, truck release wire snapped, miscellaneous electrical issues, and a lot of random rattles and ticks in the dashboard that can't be located or silenced. I wouldn't say it's unreliable, but it's not the most reliable car I've owned. My wife has a bad back and the passenger seat isn't comfortable for her. All these issues aside, I've really enjoyed the car and don't regret buying it.
I've owned this car for 63k miles now. It's been incredibly reliable, and fun to drive. I Love everything about it, except the gas mileage, which has averaged 17.9mpg. With the manual transmission, I do drive it HARD though. But it's time for some true American Muscle so I'll be selling it for a Challenger SRT8,with a manual transmission of course.
I bought my 2006 G35 Coupe automatic in 10/2006. I have had one accident, some small fender benders. Overall the performance has been great. The good: The car handles well, superb acceleration and braking. The automatic transmission has been reliable, although a little bumpy between 1st and 2nd. The styling of course is unparalleled. The interior technology package has worked well - the navigation is spot-on - a little awkward to use with the joystick inputs, but not bad for 2006. The Bluetooth has never failed though 4 iPhones. It connects every time, and the voice input is about 95% accurate. The audio system - CD changer, speakers work perfectly to this day. Electronic seat warmer and adjusters have not failed.
The bad: Interior components have been cheap. There have been a few gimpy components. The removable cupholder - very cheap and the spring broke after about 2 years. The DC socket has failed about 3-4 times. Driver window motor had to be replaced after 125k miles. The tire pressure sensor had to be replaced after 90k miles. After 80k miles, leather covering the door panels are starting to peel off, and after 120k miles, the leather on the side panels in the back have completely peeled off (and nobody ever sits back there).
The ugly: Tires - need to be replaced every 20-30k.
Overall I like this car. Performance is very reliable. I have not had many huge problems with the vehicle, however there are numerous small fixes for the car. The car is very tough on the tires (and I have a stock 18" wheels).