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Do not use a commercial coolant/antifreeze that only meets the ASTM "D3306" specification. This type of coolant/antifreeze is made for light duty automotive applications. Use only the coolant/antifreeze that is recommended. |
The following two coolants are used in Caterpillar diesel engines:
Preferred - Caterpillar Extended Life Coolant (ELC) or a commercial extended life coolant that meets the Caterpillar EC-1 specification
Acceptable - A Caterpillar Diesel Engine Antifreeze/Coolant (DEAC) or a commercial heavy-duty coolant/antifreeze that meets "ASTM D4985", "ASTM D5345" or "TMC RP329" specifications
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To ensure coolant compatibility with the Vehicle Cooling System, always check the "Vehicle Owner's Maintenance Guide" for the Vehicle Cooling System recommendations. |
Caterpillar recommends a 1:1 mixture of water and glycol. This mixture of water and glycol will provide optimum heavy-duty performance as a coolant/antifreeze.
Note: Caterpillar DEAC and other commercial heavy-duty coolant/antifreezes that meet the "TMC RP329" do not require a treatment with an SCA at the initial fill. A commercial heavy-duty coolant/antifreeze that meets "ASTM D4985" or "ASTM D5345" specifications MAY require a treatment with an SCA at the initial fill. These coolants WILL require a treatment with an SCA on a maintenance basis.
| Coolant Service Life | ||
| Coolant Type | Service Life | Treatment at Initial Fill |
| Caterpillar ELC | |
A treatment is not required. |
| Caterpillar DEAC | |
A treatment is not required. |
| Commercial Heavy-Duty Coolant/Antifreeze that meets "TMC RP329" | |
A treatment is not required. |
| Commercial Heavy-Duty Coolant/Antifreeze that meets "ASTM D5345" | |
A treatment may be required. |
| Commercial Heavy-Duty Coolant/Antifreeze that meets "ASTM D4985" | |
A treatment may be required. |