I purchased my Altima in 06 with 130,000 miles on it. It now has 181,000 miles. In May of 2008 my timing chain popped & bent my valves, it would've cost more for me to simply replace the belt & valves so I ended up getting a new motor. The timing chain breaking appears to be a common problem after 150,000 miles. If you hear any type of rattling from your motor get it checked!! Besides that, I have not had any problems with my vehicle except normal maintenance (oil changes, brakes, tires). I look forward to having this car for another 50,000 miles!!