Jeep WRANGLER 2020 Owner's Manual page 528

66 SERVICING AND MAINTENANCE
This vehicle has not been designed for use

with propylene glycol-based engine coolant.
Use of propylene glycol-based engine coolant
is not recommended.
Some vehicles require special tools to add

coolant properly. Failure to fill these systems
properly could lead to severe internal engine
damage. If the system requires the addition
of any coolant, please contact an authorized
dealer.
Adding Coolant
Your vehicle has been built with an improved
coolant (OAT coolant conforming to MS.90032)
that allows extended maintenance intervals.
This coolant (antifreeze) can be used up to ten
years or 150,000 miles (240,000 km) before
replacement. To prevent reducing this extended
maintenance period, it is important that you use
the same coolant (OAT coolant conforming to
MS.90032) throughout the life of your vehicle.
Please review these recommendations for
using Organic Additive Technology (OAT) coolant
that meets the requirements of FCA Material
Standard MS.90032. When adding coolant:
We recommend using Mopar® Antifreeze/

Coolant 10 Year/150,000 Mile (240,000 km)
Formula OAT that meets the requirements of
FCA Material Standard MS.90032.
Mix a minimum solution of 50% OAT coolant

that meets the requirements of FCA Material
Standard MS.90032 and deionized, or
distilled water. Use higher concentrations
(not to exceed 70%) if temperatures below
−34°F (−37°C) are anticipated.
CAUTION!
Use only high purity water such as deionized,
or distilled water when mixing the water/
coolant (antifreeze) solution for the engine,
battery or high voltage electronics cooling
systems. The use of lower quality water will
reduce the amount of corrosion protection in
the engine cooling system.
Please note that it is the owner's responsibility
to maintain the proper level of protection
against freezing according to the temperatures
occurring in the area where the vehicle is
operated.
NOTE:
Mixing coolant types is not recommended

and can result in cooling system damage. If
HOAT and OAT coolant are mixed in an emer-
gency, have a authorized dealer drain, flush,
and refill with OAT coolant (conforming to
MS.90032) as soon as possible.
Low pressure expansion bottles for power

electronics and battery cooling require a
special tool for removing the cap from the
expansion bottle. For the battery coolant
bottle, it is important to not add coolant if
level is low. The vehicle should be taken to an
authorized dealer for proper servicing of the
battery coolant loop if this should occur.
Cooling System Pressure Cap
The cap must be fully tightened to prevent loss
of engine coolant (antifreeze), and to ensure
that engine coolant will return to the radiator
from the coolant expansion bottle/recovery
tank (if equipped).
The cap should be inspected and cleaned if
there is any accumulation of foreign material on
the sealing surfaces.