Extreme Cold Weather (Below -22°F Or −30°C); After Starting; Engine Break-In Recommendations; Parking Brake - Jeep Wrangler Owner's Manual

94 STARTING AND OPERATING
WARNING!
 Do not attempt to push or tow your vehicle to get it
started. Vehicles equipped with an automatic trans-
mission 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
page 213.
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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.
E C W
XTREME OLD EATHER
(B –22°F O −30°C)
ELOW R
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 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.
While cruising, 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.
For the recommended viscosity and quality grades
page 280.
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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 inter-
preted as a problem.

PARKING BRAKE

Before exiting the vehicle, make sure that the parking
brake is fully applied. Also, be certain to leave the
transmission in PARK.
The parking brake lever is located in the center console.
To apply the parking brake, pull the lever up as firmly as
possible. To release the parking brake, pull the lever up
slightly, push the center button, then lower the lever
completely.