2015 Nissan Murano Owner's Manual - Page 316

4. Plug the extension cord into a Ground Fault Interrupt (GFI) protected, grounded 110volt AC (VAC) outlet. 5. The engine block heater must be plugged in for at least two to four hours, depending on outside temperatures, to properly warm the engine coolant. Use an appropriate timer to turn the engine block heater on. 6. Before starting the engine, unplug and properly store the cord to keep it away from moving parts. Starting and driving 5-71