My 2005 black on black sedan g35 has about 134,000 miles on it. Runs great, not as smooth as it was when it was 55k but the power is still there. I can push it 60-80 mph easily at 3000-4000 rpm. It runs like its dirty inside, I'm looking into ways of cleaning out all the gunk inside in the engine. I still need to replace the serpentine belts, check the timing, change fuel filter, change fuel gauge, change cd player, change left blinker bulb on the dash board, rear bumper needs to be repainted due to chips, install some better cross-drilled rotors on the front wheels, I need to replace a part for the air bag. It's a great used car, I'd say. Well taken cared of. I got 5 g's on it left at 288 per month. G35 are well made cars. They aren't the best but I rather get a Infiniti than a honda/acura anyday. They made with a little bit more quality.