After driving a short distance to exit a parking lot and waiting for an opening in traffic on a busy four-lane road with a speed limit of 50 mph, I hit the gas to accelerate into an opening and nothing happened, no forward motion. And there have been subsequent incidents; one involved trying to cross a busy street from a stop sign. This is a definite safety issue; when the drive train is unresponsive in such circumstances, people could be injured or killed. Today, I took my vehicle to a Nissan dealer for an oil change and to have this anomaly checked out. They have informed me the radiator cracked, leaked coolant into the automatic transmission, and both must be replaced. This is being done at no cost to me, as there is a known issue with the radiator cracking for which Nissan has increased the warranty to 8 years or 80,000 miles. However, the warranty notification doesn't mention the transmission may be compromised, stating only, "in vehicles equipped with automatic transmissions, a crack in the radiator assembly might occur at higher mileages leading to internal leakage of engine coolant." My vehicle is four years old and just hit 12,000 miles.

- Irvine, CA, USA

This vehicle has a known problem among Nissan Frontier message boards. When you fill the gas tank you must fill it slowly or the gas will "bubble up" and spill out of the entrance where you put the gas nozzle. It will run down the fender, onto the paint, and onto the ground. The effect is very similar to what happens to this 2007 Dodge durango www.youtube.com/watch?V=fs5U63cn-II but with less force when expelling the fuel. This is a repeated issue that has been ongoing since I have owned the vehicle. Nissan refuses to acknowledge that this is due to a bad design and will not fix this. I have to slowly fill my tank every time. This means to not get it to spill I have to fill an 18 gallon tank no faster than 15 minutes in order not to spill fuel on the ground.

- Austin, TX, USA