My truck is about 15 months old now. I've had it in the shop around 10 times for various things. We've owned 5 other nissan vehicles in the past 6 years, and this truck is anything but what I've come to expect from them as far as quality goes . Two days ago I began to feel and hear a knock coming from the engine at idle. After 5 minutes of sitting in my parking lot at work, it intensified so I called my dealer and told them I was bringing it in. 15 minutes later, when I arrived at the service department, my truck was visually and audibly knocking and sputtering, garnering all of the attention from the service team and customers. It smelled like it was on fire. I was so pissed off that I couldn't see straight. I lost my cool and told them what a piece of **** this $56,000 truck has been. This truck had cost me around 20 hours of work at this point and, by the way, they are also fixing my rear windows, which do nothing when the switch is engaged. My advice : if you haven't already, buy an f250 if you want a diesel or a tundra if gas is more appealing. I'll never buy another nissan. THIS TRUCK IS A HUNK OF ****!!!!!! EXCUSE MY LANGUAGE.