IS your GTR in storage because of the weather? It may be a good idea if you're really worried about your vehicle to get a mechanic in and give it a proper tune up just to make sure eveyrthing is okay after coming out of the cold. At the same time, besides changing the oil and tires like what @jjman suggested, just make sure that you give the car a bit of time to warm up before taking it out of storage for a spin. Have fun!