Jeep Commander Owner's Manual page 474

M
472 MAINTENANCE SCHEDULES
A
I
CAUTION!
N
T
E
Failure to perform the required maintenance items
N
may result in damage to the vehicle.
A
N
C
Required Maintenance Intervals
E
NOTE: ** Vehicles built with the 4.7L engine are
S
equipped with sixteen spark plugs, one set is located on
C
the top of the engine under the coils and the second set is
H
E
located on the side of the engine.
D
U
L
E
S
8
The spark plugs located under the coils are a standard
plug and must be change every 30,000 miles (50 000 km)
The spark plugs located on the side of the engine are a
premium plug and must be changed every 102,000 miles
(170 000 km).