Cold Weather Operation (Below -22°F Or −30°C); After Starting; Engine Block Heater - If Equipped; Engine Break-In Recommendations - Jeep GRAND CHEROKEE L 2021 Owner's Manual

118 STARTING AND OPERATING
WARNING!
Never pour fuel or other flammable liquid into

the throttle body air inlet opening in an
attempt to start the vehicle. This could result
in flash fire causing serious personal injury.
Do not attempt to push or tow your vehicle to

get it started. Vehicles equipped with an auto-
matic transmission cannot be started this
way. Unburned fuel could enter the catalytic
converter and once the engine has started,
ignite and damage the converter and vehicle.
If the vehicle has a discharged battery,

booster cables may be used to obtain a start
from a booster battery or the battery in
another vehicle. This type of start can be
dangerous if done improperly
CAUTION!
To prevent damage to the starter, do not
continuously crank the engine for more than
10 seconds at a time. Wait 10 to 15 seconds
before trying again.
C W
OLD EATHER
(B –22°F O
ELOW
To ensure reliable starting at these temperatures,
use of an externally powered electric engine block
heater (available from an authorized dealer) is
recommended.
A S
FTER TARTING
The idle speed is controlled automatically, and it
will decrease as the engine warms up.
ENGINE BLOCK HEATER — IF EQUIPPED
The engine block heater warms the engine, and
permits quicker starts in cold weather. Connect the
cord to a standard 110-115 Volt AC electrical
outlet with a grounded, three-wire extension cord.
page 291.
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The engine block heater must be plugged in at
least one hour to have an adequate warming effect
on the engine.
The engine block heater cord is coiled and
strapped right behind the engine air cleaner filter
assembly from the manufacturer.
Remember to disconnect the engine block
heater cord before driving. Damage to the
110-115 Volt electrical cord could cause
electrocution.
O
PERATION
−30°C)
R
WARNING!

ENGINE BREAK-IN RECOMMENDATIONS

A long break-in period is not required for the engine
and drivetrain (transmission and axle) in your
vehicle.
Drive moderately during the first 300 miles
(500 km). After the initial 60 miles (100 km), speeds
up to 50 or 55 mph (80 or 90 km/h) are desirable.
Brief full-throttle acceleration within the limits of
local traffic laws contributes to a good break-in.
Wide-open throttle acceleration in low gear can be
detrimental and should be avoided.
The engine oil installed in the engine at the factory is
a high-quality energy conserving type lubricant. Oil
changes should be consistent with anticipated
climate conditions under which vehicle operations
will occur page 308.
Ú
CAUTION!
Never use Non-Detergent Oil or Straight Mineral
Oil in the engine or damage may result.
NOTE:
A new engine may consume some oil during its first
few thousand miles (kilometers) of operation. This
should be considered a normal part of the break-in
and not interpreted as a problem. Please check your
oil level with the engine oil indicator often during the
break-in period. Add oil as required.