CAUTION: Use of Propylene Glycol based coolants is not recommended, as they provide less freeze pro-
tection and less corrosion protection.
The cooling system is designed around the coolant. The coolant must accept heat from engine metal, in the cylinder
head area near the exhaust valves and engine block. Then coolant carries the heat to the radiator where the tube/
fin radiator can transfer the heat to the air.
The use of aluminum cylinder blocks, cylinder heads, and water pumps requires special corrosion protection.
Mopar
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Antifreeze/Coolant, 5 Year/100,000 Mile Formula (MS-9769), or the equivalent ethylene glycol base coolant
with organic corrosion inhibitors (called HOAT, for Hybrid Organic Additive Technology) is recommended. This cool-
ant offers the best engine cooling without corrosion when mixed with 50% Ethylene Glycol and 50% distilled water
to obtain a freeze point of -37°C (-35°F). If it loses color or becomes contaminated, drain, flush, and replace with
fresh properly mixed coolant solution.
CAUTION: Do not use coolant additives that are claimed to improve engine cooling.
CAUTION: Mopar
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Antifreeze/Coolant, 5 Year/100,000 Mile Formula (MS-9769) may not be mixed with any
other type of antifreeze. Mixing of coolants other than specified non-HOAT or other HOAT coolant, may
result in engine damage that may not be covered under the new vehicle warranty, and decreased corrosion
protection.
COOLANT PERFORMANCE
The required ethylene-glycol (antifreeze) and distilled water mixture depends upon climate and vehicle operating
conditions. The coolant performance of various mixtures follows:
Pure Distilled Water - Distilled water can absorb more heat than a mixture of water and ethylene-glycol. This is for
purpose of heat transfer only. Water also freezes at a higher temperature and allows corrosion.
100 percent Ethylene-Glycol - The corrosion inhibiting additives in ethylene-glycol need the presence of distilled
water to dissolve. Without water, additives form deposits in system. These act as insulation causing temperature to
rise to as high as 149°C (300°F). This temperature is hot enough to melt plastic and soften solder. The increased
temperature can result in engine detonation. In addition, 100 percent ethylene-glycol freezes at -22°C (-8°F).
50/50 Ethylene-Glycol and Distilled Water - Is the recommended mixture, it provides protection against freezing to
-37°C (-34°F). The antifreeze concentration must always be a minimum of 44 percent, year-round in all climates. If
percentage is lower, engine parts may be eroded by cavitation. Maximum protection against freezing is provided
with a 68 percent antifreeze concentration, which prevents freezing down to -67.7°C (-90°F). A higher percentage
will freeze at a warmer temperature. Also, a higher percentage of antifreeze can cause the engine to overheat
because specific heat of antifreeze is lower than that of water.
CAUTION: Richer antifreeze mixtures cannot be measured with normal field equipment and can cause prob-
lems associated with 100 percent ethylene-glycol.
TRANSFER CASE
Recommended lubricant for the MS140 transfer case is Mopar
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Transfer Case Lubricant - LX.
BRAKE FLUID
The brake fluid used in this vehicle must conform to DOT 3 specifications and SAE J1703 standards. No other type
of brake fluid is recommended or approved for usage in the vehicle brake system. Use only Mopar
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Brake Fluid or
equivalent from a tightly sealed container.
CAUTION: Never use reclaimed brake fluid or fluid from an container which has been left open. An open
container of brake fluid will absorb moisture from the air and contaminate the fluid.
CAUTION: Never use any type of a petroleum-based fluid in the brake hydraulic system. Use of such type
fluids will result in seal damage of the vehicle brake hydraulic system causing a failure of the vehicle brake
system. Petroleum based fluids would be items such as engine oil, transmission fluid, power steering fluid,
etc.
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LUBRICATION AND MAINTENANCE
LX