Gasoline Engine Oil

WARNING: This page is about a different car, the 2007 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

SAE 5W-30 viscosity oil is preferred for all temperatures. SAE 10W-30 and 10W-40 viscosity oil may be used if the ambient temperature is above -18°C (0°F).
Use of 5W-30 viscosity oil will increase fuel economy.

Fig 1: Identifying Gasoline Engine Oil SAE Viscosity

Courtesy of NISSAN MOTOR CO., U.S.A.