NISSAN 2015 Murano - Owner's Manual - Manual (Page 316)

4. Plug the extension cord into a Ground Fault
Interrupt (GFI) protected, grounded 110-
volt 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 prop-
erly store the cord to keep it away from
moving parts.
Starting and driving 5-71