Heavy Duty Diesel Engine Coolant

The engine cooling system is filled with coolant to provide year-round protection against corrosion and cylinder liner pitting, and winter freeze protection.

The following coolants are preferred:

• John Deere COOL-GARD™ II is the preferred coolant.
• John Deere COOL-GARD™ II WATER-BASE.
• John Deere COOL-GARD™ II PG.

John Deere COOL-GARD™ II coolant is available in the following proportions:

• John Deere COOL-GARD II 50/50 Pré-Mix (Already solved in the correct proportion).
• John Deere COOL-GARD II Concentrate (Concentrate to be mix by customer).

IMPORTANT: When using the coolant John Deere COOL-GARD™ II Concentrate respects mixture of 50% COOL-GARD™ II Concentrate and 50% quality water. Incorrect mixture can cause irreversible damage to the cooling system.

Take as reference the temperatures on the following table to use the right mix according to the climate in your region:

COOL-GARD II Premix	Freezing Point
COOL-GARD II 50/50	-37° C (-34° F)

Use coolant John Deere COOL-GARD™ II WATER-BASE in very hot weather.

Use coolant John Deere COOL-GARD™ II PG is required when a formula nontoxic.

Other coolants

It is possible that the coolants John Deere COOL-GARD II, COOLGARD II WATER-BASE and COOL-GARD II PG are unavailable in the region where maintenance is performed.

If these coolants are not available, use a coolant concentrate or prediluted coolant for use in heavy-duty diesel engines with the following physical and chemical properties:

• Formulated with a quality nitrite-free additive package.
• Provides cylinder liner cavitation protection according to either the John Deere Cavitation Test Method or a fleet study run at or above 60% load capacity.
• Protects the cooling system metals (cast iron, aluminum alloys, and copper alloys such as brass) from corrosion.

The additive package must be part of one of the following coolant mixtures:

• Coolant heavy duty with ethylene glycol or propylene glycol base prediluted.
• Concentrate coolant based on propylene glycol recommended a mixture of labeling with water quality.

Water quality

Water quality is important to the performance of the cooling system. Distilled, deionized, or demineralized water is recommended for mixing with ethylene glycol and propylene glycol base engine coolant concentrate.

IMPORTANT: Do not use cooling system sealing additives or antifreeze that contains sealing additives.

Do not mix ethylene glycol and propylene glycol base coolants.

Do not use coolants that nitrites.