I traded an '04 6MT G35 in on my 370Z a year ago. 9000 miles so far. No rattles but the interior noise on grooved freeways, caused by the tires is very, very high. Takes a lot of the fun out of long cruises. It is burning some oil, about 1 qt. per 3000 miles. Not enough to worry about but enough that I keep an eye on it. Hoping it will taper off after a few thousand more miles. The highest oil temp I have experienced was about 235 degrees with somewhat spirited driving on a very hot day. I wouldn't worry unless it was consistently close to 260+.
My G35 was a very expensive car to own. The tires were only good for about 25K miles if lucky, Brembo brakes were shot at 40K and cost $1800 to replace the pads and surface the rotors, and after 5 years and about 75K miles the interior was showing signs of wear to the leather. In fact the driver's seat started to look like crap after the 3rd. year. I hope the 370Z holds up better.
At times I miss the trunk of the G35 and the sunroof, but overall I love my Z.
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