Do not use propylene glycol in concentrations that exceed
50 percent glycol because of propylene glycol's reduced
heat transfer capability. Use ethylene glycol in conditions
that require additional freeze or anti-boil protection.
SMCS Code: 1350; 1352; 1395
The following two coolants are used in Caterpillar machine
Preferred - Caterpillar Extended Life Coolant (ELC) or a
commercial ELC that meets the Caterpillar specification (EC-
Acceptable - A Caterpillar Diesel Engine Antifreeze/Coolant
(DEAC) or a commercial heavy-duty coolant/antifreeze that
meets "ASTM D4985" or "ASTM D5345" specifications.
Do not use a commercial coolant/antifreeze that only
meets the ASTM D3306 or D4656 specification. This type
of coolant/antifreeze is made for light duty automotive
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.
Caterpillar DEAC does not require a treatment
with an SCA at the initial fill. However, a
commercial heavy-duty coolant/antifreeze that
specifications requires a treatment with an SCA at
the initial fill.
Service Life Before Flushing and Before Refilling
6000 hours or 6 years
3000 hours or 3 years
3000 hours or 2 years
meets "ASTM D5345"
or TMC RP329"
3000 hours or 1 year
meets "ASTM D4985"
Extended Life Coolant (ELC)
SMCS Code: 1350; 1352; 1395
Caterpillar provides Extended Life Coolant (ELC) for use in the
Heavy-duty diesel engines
Natural gas engines
The anti-corrosion package for Caterpillar ELC is different from
the anti-corrosion package for other coolants. Caterpillar ELC
is an ethylene glycol base coolant. However, Caterpillar ELC
contains organic corrosion inhibitors and antifoam agents with
low amounts of nitrite. Caterpillar ELC has been formulated
with the correct amounts of these additives in order to provide
superior corrosion protection for all metals in the cooling
system of diesel engines.
Caterpillar ELC extends the service life of the coolant to 6000
service hours or six years. ELC does not require the frequent
additions of a Supplemental Coolant Additive (SCA). An
Extender is the only additional maintenance that is needed at
3000 service hours or one-half of the service life.
ELC is available in a 1:1 premixed cooling solution with distilled
water. The 1:1 premixed cooling solution of ELC will lower the
freezing point of the coolant to a temperature of -36°C (-33F).
ELC Concentrate can be used to lower the freezing point to -
51C (-60F) for arctic conditions.
Containers of several sizes are available. Consult your
Caterpillar dealer for the part numbers.
ELC can be recycled. The drained coolant mixture can be
distilled in order to remove the ethylene glycol and the water.
The ethylene glycol and the water can be reused. Consul your
Caterpillar dealer for more information.
If Caterpillar ELC is not used, then select a commercial ELC
that meets the Caterpillar specification of EC-1 and either the
specification. Do not use a long life coolant that does not meet
the EC-1 specification. Follow the maintenance guide for the
coolant from the supplier of the commercial ELC. Follow the
Caterpillar guidelines for the quality of water and the specified
coolant change interval.
Cooling System Specifications