



measurements. Test strips, although less accurate than a refractometer, will also
provide an indication of freeze protection and additive levels. See Section 6 Coolant Testing for further information and test strip part numbers.
Test the coolant every 240,000 km [150,000 mi], 4000 hours or once per year,
whichever occurs first, to determine if it must be replaced. See Section 6 - Coolant
Testing for further information and test strip part numbers.
Replace the coolant only if the replacement limits are exceeded.

SCA Levels
Test the SCA level a minimum of twice a year.








If the SCA concentration level is between 0.3 and 1.3 units/liter [1.2 and 5.0 units
per gal], either install a chemical filter containing the appropriate dosage of SCA or
add the equivalent liquid SCA dosage and install a chemical free filter. For large
cooling systems, it can be necessary to replenish SCA with both a chemical filter
and liquid SCA.
If the SCA concentration level is less than 0.3 units/liter [1.2 units per gal], add 0.15
liters [5 ounces] of Fleetguard® DCA4 or Fleetcool liquid per 3.8 liters [1 gal] of
cooling system capacity and install a chemical filter.
If the SCA concentration level is greater than 1.3 units/liter [5.0 units per gal], install
a chemical free filter. Do not install a chemical coolant filter or add liquid
Extender/SCA. Test the SCA level at each successive oil change. When SCA units
drop below 1.3 units per liter [5.0 units per gal], resume installing chemical filters or
using the equivalent liquid SCA dosage and installing chemical free filters.
Consult Cummins® Filtration Technical Assistance for detailed Fleetguard® product
information and assistance at 800-223-4583 or www.Cumminsfiltration.com.

Section 3 - Extended Service Interval
This section covers the requirements for coolant products that provide extended service
maintenance intervals.
Extended service interval coolant is defined as a coolant capable of a minimum general
routine service interval of 240,000 km [150,000 mi], 4000 hours, or 1 year, whichever
occurs first. It must be noted that organic acid technology (OAT) coolants are generally
capable of extended service intervals ranging from 500,000 km to 1,000,000 km [300,000
mi to 600,000 mi] or 6000 hours to 7000 hours. Follow maintenance guidelines
recommended by the coolant manufacturer.
Successful usage of extended service interval products will be possible only if a
systematic approach to coolant maintenance is followed by the user. This means using the
extended service interval system of coolant products for all coolant maintenance at the
fleet shop as well as on the road. Use of the proper coolant is vital for successful extended
service interval maintenance. If control of top-off can not be accomplished, do not
consider extended service and use the standard service interval as described in Section 2.
Coolant must meet the requirements stated in this section.

It is preferred and recommended for all Cummins® engines to top off only with fully
formulated coolants which meet Cummins Engineering Standard 14603. See Attachment 2
for more information on Cummins Engineering Standard 14603. However, MidRange
products, including any Cummins® engine displacing less than 10 liters [610 C.I.D.], may
top off with fully formulated coolants meeting a minimum requirement of ASTM D6210.
Cummins Inc. recommends Fleetguard® Antifreeze Coolants including ES Compleat
containing DCA4 Plus, Fleetcool EX containing DCA2 Plus, and ES Compleat organic acid
technology (OAT), which meet the requirements of Cummins Engineering Standard 14603.

Cummins® Engines That are Using Chevron® Texaco™
or Shell™ Rotella™ Extended Life Coolant (TELC) Plus
Silicates
OAT coolants, such as Chevron® Texaco™, Shell™ Rotella™ or their private label
counterparts, which do not meet the elastomer compatibility section of Cummins
Engineering Standard (CES) 14603, are acceptable for extended service interval use in
Heavy-Duty and High Horsepower engines if the initial coolant fill requirements were met
by the vehicles' original equipment manufacturer (OEM), (including the addition of
silicates). See Cummins AEB 90.47 which can be accessed on
http://www.gce.cummins.com. All midrange engines are TELC compatible without the
addition of silicates.
Heavy-Duty and High Horsepower engines requiring overhauls or repairs involving the
replacement of the following components that are using OAT coolants not meeting CES
14603, must discard the original coolant and replace with new.







Rocker lever housing
Oil cooler housing
Cylinder head gasket
Thermostat housing gasket
Oil cooler cover gasket
V cavity gasket

If the replacement coolant is Chevron® Texaco™, Shell™ Rotella™ or their private label
counterparts, which do not meet the elastomer compatibility section of CES 14603, the
coolant must be treated by adding 0.24 liter [8 oz] of liquid silicate fluid for every 45 liters
[12 gal] of total coolant system volume. It is critical to not over treat the coolant with
silicate fluid. If over-treatment is suspected, drain the cooling system and discard the filter.
Clean the cooling system immediately. Symptoms of silicate over-treatment can be
thickened coolant in the lower radiator tank, water pump seal leakage soon after silicate
addition, reduced heater output and/or elevated engine temperatures. Use Fleetguard®
Restore™ Cooling System Cleaner at the rate of 3.8 liters [1 gal] per 38 to 45 liters [10 to
12 gal] of water. Do not use Restore with normal engine coolant.
To obtain order forms or ask questions relative to ordering the silicate fluid:

Phone: 800-346-9041
Fax: 800-876-5317
Mail To:




Silicate Fluid Order Program
P.O. Box 27388
Houston, TX 77227-7388

Extended Service Maintenance




Fill the cooling system with premixed fully formulated coolant or with a 50/50
mixture of high-quality water (see Section 9 - Water Quality Requirements) and fully
formulated concentrated antifreeze. The fully formulated coolant or antifreeze,
either ethylene glycol or propylene glycol, must meet Cummins Engineering
Standard 14603. Cummins Inc. recommends using Fleetguard® ES™ Compleat.
Some extended service interval systems do not require the initial use of an
Extender additive in liquid form or from a slow-release filter. In these systems, the
antifreeze/coolant must provide cavitation-corrosion (liner-pitting) protection
through the use of the liner-pitting protection additives in the concentrations listed in
Table 2. Extender/Extended Service Additive is then added at each extended
service interval.

Table 2 - Liner Pitting Protection Additive Levels
Required at Initial System Fill
NOTE: Some OAT coolants do not need nitrite and or molybdate for liner pitting.

Additive

Premixed
Antifreeze/
Type of Coolant
(See
Coolant (ppm)
Additive
Note 1)

Minimum Nitrite (measured as NO2)
Minimum Levels of Nitrite (measured as NO2) and
Molybdate (measured as MoO4)

2000 ppm
1300 ppm (See Note
2)

DCA2
DCA4

NOTE: 1: Concentrated antifreeze/coolant levels are double the premixed levels.
NOTE: 2: A combination of nitrite (NO2) and molybdate (MoO4) can not contain less
than 500 ppm of either additive
NOTE: 3: Some OAT coolants use high levels of organic acids for liner pitting
protection and do not use nitrite and or molybdate.











Top off the cooling system as needed using only fully formulated antifreeze/coolant
meeting Cummins Engineering Standard 14603.
The coolant must be tested twice per year for freeze protection and additive levels.
A Refractometer provides the most accurate freeze protection measurements. Test
strips, although less accurate than a refractometer, will also provide an indication of
freeze protection and additive levels. See Section 6 - Coolant Testing for further
information and test strip part numbers.
After 240,000 km [150,000 mi], 4000 hours, or 1 year, whichever occurs first, do the
following:
Change the coolant filter(s). The coolant filter must meet Cummins Engineering
Standard 14315.
Replenish depleted coolant additives either by using slow-release ES™ chemical
filter or adding ES™ Extender liquid. Larger cooling systems may require the use of
a chemical filter in conjunction with liquid additive. See the remainder of this section
for filter and liquid part numbers.
Test the coolant to determine if it must be replaced. See Section 6- Coolant Testing
for further information and test strip part numbers.
Replace the coolant only if the replacement limits are exceeded.

Extender/Extended Service Additive Levels
Test the SCA level a minimum of twice a year.










Target 0.6 units/liter [2.5 units/gal] in coolant solutions of 40 to 60 percent antifreeze
concentrations.
If the SCA concentration level is between 0.3 and 1.3 units/liter [1.2 and 5.0 units
per gal], either install a chemical filter containing the appropriate dosage of
Extended Service Additive or add the equivalent liquid Extended Service Additive
dosage and install a chemical free filter. For large cooling systems, it can be
necessary to replenish SCA with both an Extended Service Additive chemical filter
and liquid Extended Service Additive.
If the SCA concentration level is less than 0.3 units/liter [1.2 units per gal], add 0.15
liters [5 ounces] of Fleetguard® Extender liquid Extended Service Additive per
gallon of cooling system capacity and install a chemical filter.
If the SCA concentration level is greater than 1.3 units/liter [5.0 units per gal], install
a chemical free filter. Do not install a chemical coolant filter or add liquid
Extender/Extended Service Additive. Test the SCA level at each successive oil
change. When SCA units drop below 1.3 units per liter [5.0 units per gal], resume
installing chemical filters or using the equivalent liquid Extended Service Additive
dosage and installing chemical free filters.
Consult Cummins® Filtration Technical Assistance for detailed Fleetguard® product
information and assistance at 800-223-4583 or www.Cumminsfiltration.com.
Some OAT coolants use high levels of organic acids for liner pitting protection and
do not use nitrite and or molybdate. Therefore, these coolants do not have SCA
numbers.

Extender Requirements

CAUTION
Extenders used in extended service interval systems are not fully formulated and must not
be used in treated water coolants. Their usage can result in engine damage. See Section
8.
The Extender replaces the additives in the coolant that are lost due to depletion. It can be
added as a liquid directly to the coolant or as a solid contained in a coolant filter.
Cummins Inc. recommends using a Fleetguard® ES™ slow release filter or ES™ Extender
liquid.

Performance Requirements
The Extender must contain sufficient liner-pitting additives to increase the levels of nitrite
or nitrite plus molybdate in the engine coolant by the following amounts:



At least 800 ppm (0.8 units per gallon) of nitrite (NO2)
Or a combined total of at least 520 ppm (0.8 units per gallon) of nitrite (NO 2) and
molybdate (MoO4).

A combination of nitrite and molybdate can not contain less than 200 ppm of either
additive.

Storage Stability
Liquid Extenders typically have a shelf life of at least 2 years from the time of manufacture
when stored at temperatures ranging from -7° to 55°C [19° to 131°F].
Solid material, liquid turbidity, or layering at the top of the liquid is allowed if it will dissolve
and disperse by stirring the solution and warming it to a temperature between 2° to 67°C
[36° to 153°F].
Solid, slurry, and paste forms of Extender must dissolve completely in hot engine coolant.
They must be formulated and packaged to prevent chemical or physical change during
storage temperatures ranging from -7° to 55°C [19° to 131°F] regardless of humidity.


Consult Cummins® Filtration Technical Assistance for detailed Fleetguard® product
information and assistance at 800-223-4583 or www.cumminsfiltration.com.

Section 4 - Unacceptable Maintenance Practices for
Cooling Systems

WARNING
All diesel engines with wet liners are subject to liner pitting if the cooling system is not
correctly maintained. Underconcentration (below 0.3 units per liter [1.2 units per gal] of
Extended Service Additive/SCA results in liner cavitation and possible engine failure.
Overconcentration (above 1.3 units per liter [5.0 units per gal] of additives) or the use of
high-silicate antifreeze can result in silicate gelation or water pump seal leakage.
NOTE: Some OAT coolants use high levels of organic acids for liner pitting
protection and do not use nitrite and or molybdate. Therefore, these coolants do not
have SCA numbers.
Unacceptable Practices - The following practices are considered unacceptable and may
lead to engine failure.










Use of high-silicate antifreeze.
Underconcentration or overconcentration of Extended Service Additive/SCAs.
Use of antifreezes/coolants that are not fully formulated for extended service
intervals (for instance, GM 6038M or ASTM D4985 antifreeze).
Use of soluble oils in the cooling system.
Use of poor-quality water. See Section 9 for water quality requirements.
Use of antifreeze, Extended Service Additive/SCA or coolant filter(s) that do not
meet the specifications indicated in this Service Bulletin.
Use of Treated Water coolant with EGR engines.
Use of coolants with less than 40 percent antifreeze for EGR engines.
Use of coolants with less than 25 percent antifreeze for marine engines.

Section 5 - Recommended Maintenance Practices for
Cooling Systems of A, B, and F Series Engines
The A and B Series engines normally do not require Extender/SCA because they do not
normally experience cylinder bore/liner cavitation corrosion. Also, the A and B Series
engines do not have an integral coolant filter.
Coolant maintenance requirements for the Cummins® B series engines depend on the
application.
Light duty applications can use coolant meeting ASTM D3306 and follow the maintenance
schedule in the appropriate Owners manual. However, if ASTM D3306 antifreeze is used,
it must additionally meet the elastomer capability section of Cummins Engineering
Standard 14603.

Use of fully formulated antifreeze/coolant in this engine is acceptable but not required. If
fully formulated antifreeze/coolant is used, it must meet a minimum requirement of ASTM
D6210.
The F-Series engines must use coolant meeting ASTM D3306, except North America
Industrial F-Series which may also use coolant meeting ASTM D6210. The F-Series must
follow the maintenance schedule in the appropriate Owners or Operation and Maintenance
Manual.
Section 6 - Coolant Testing
Coolant testing is required for two reasons:
1. To determine the additive concentration and glycol level of the coolant. This will
make sure that adequate liner pitting protection and freeze point protection are
achieved.
2. To determine if the coolant must be replaced due to contamination.
Coolant testing for additive and glycol levels must be performed at least twice a year. The
coolant must also be tested for replacement limits every 240,000 km [150,000 mi], 4000
hours, or once a year, whichever occurs first.
Additive and glycol testing is also recommended when the following occur:





Coolant loss between test intervals exceeds 10 to 15 percent of system capacity
Water pump seal, radiator core, or other external leakage is apparent
Anytime the coolant condition is unknown, or corrosion is apparent within the
cooling system
Anytime a cooling system component is repaired or replaced.

Coolant Replacement Limits
Table 3 below lists the limits for various coolant contaminants.

Table 3 - Coolant Replacement Limits
Contaminant

Allowable Level

Sulfate (SO4)

1500 ppm, maximum

Chloride (Cl) Fluoride, Bromide

200 ppm, maximum

Oil or fuel contamination

Coolant must not contain oil or fuel

pH

6.5, minimum (See Note 1)

Grease, solder bloom, silica gel, rust, or
scaling

Coolant must be free of these
contaminants



The minimum pH for a replacement limit can vary according to the product. Consult
the product manufacturer for the pH limit. A pH less than 6.5 is always
unacceptable. For Fleetguard® ES™ Compleat™ coolant, the coolant must be
replaced if the pH is below 7.5 pH.

Bromide is typically a contaminant from radiator flux and fluoride is a contaminant from
brazing flux. Both bromide and fluoride are corrosive especially to aluminum parts.
If the coolant does not meet the replacement limits of sulfate, chloride, or pH, it must be
drained and replaced with new coolant meeting Cummins Engineering Standard 14603.
However, if the coolant is contaminated with oil, fuel, grease, solder bloom, silica gel, rust,
or scaling, the system must be drained, cleaned, and refilled. See Section 11 for details
on cleaning the cooling system.

Coolant Testing Kits
Coolant testing and monitoring are useful tools for tracking and controlling coolant
condition and performance. The methods available for testing coolants include field test
kits, portable refractometers, and coolant analysis programs. Cummins Inc. recommends
using the following Fleetguard® products:
Coolant Additive and Glycol level testing:


Three-Way™ Heavy Duty Coolant Test Kits
Part Number

Quantity

Foil Sealed

CC2602

50

No

CC2602A

4

Yes

CC2602B

100

Yes

Coolant testing for contamination/replacement limits:


Quick-Chek™ Test Kits
Part Number

Quantity

Foil Sealed

CC2607B

100

Yes

CC2607C

25

Yes

Coolant Freeze Point Testing

SMALL | MEDIUM | LARGE

Refractometer, Part Number CC2806

For use with ethylene and propylene glycol coolants only.

SMALL | MEDIUM | LARGE

Refractometer, Part Number CC36049

For use with glycerin coolant only.
Coolant analysis program.


Monitor C™ program, part number CC2700

The Three-Way™ heavy duty coolant field test kit is appropriate for testing nitritemolybdate formulations, such as Fleetguard® DCA-4 as well as nitrite formulations such
as Fleetguard® DCA2 (Fleetcool).
Fleetguard® Quik-Chek™ test strips will detect contamination levels that indicate
replacement of the coolant is required.
The Monitor C™ program can evaluate most new or used coolant formulations.
Field test kits offer the benefit of on-site measurements and are designed to approximate
Extender/SCA levels and freezing points. When required, freezing points can be more
accurately determined with on-site refractometer readings.

When using the Fleetguard® Three-Way™ heavy duty coolant test kit, it is important to
follow the instructions provided in the kit. Contact Cummins® Filtration Technical
Assistance at 800-223-4583 or www.Cumminsfiltration.com for additional information.
Because the kit measures nitrite and molybdate separately, it can reliably measure both
Fleetguard® SCA formulations as well as most competitive SCA formulations. Cummins
Inc. recommendation for a nitrite-molybdate formulation for pitting protection is explained
in Attachment 1 - Summary of Coolant Additive Technology.

CAUTION
These types of SCA kits are NOT effective on OAT coolants that are not formulated with
nitrite and/or molybdate. Some coolant manufacturers of the OAT coolants have
developed specific test kits for these types of coolants. Follow the coolant manufacturers'
instructions for coolant testing on OAT coolants.
Correct interpretation of laboratory data can provide additional guidance in coolant
treatment effectiveness and early warning detection. Interpretation and further treatment
action(s) are generally provided with laboratory results. Therefore, laboratory testing is
typically very cost effective for the long term when used to optimize cooling system
performance and life. However, it must not be used as a method for minimizing treatment.
Coolant analysis programs are performed in laboratories and offer additional, useful
information, but require mailing coolant samples to a laboratory. Laboratory measurements
typically include the following:








pH level
Extender/SCA level
Freezing point protection
Buffer level
Dissolved solids
Silicate level
Metal corrosion products.

See Attachment 3 for a sample Monitor C™ report.

Section 7 - Antifreeze
The primary purpose of antifreeze is to lower the freezing point of the coolant. Additional
performance characteristics of coolants that are affected by the use of antifreeze include
boiling point and vapor pressure. Antifreeze decreases vapor pressure, which is very
beneficial to the reduction of cavitation corrosion liner pitting. This characteristic is the

primary basis for Cummins Inc. requirement for increased SCA levels when antifreeze falls
below 40 percent by volume.
A 50/50 mixture of antifreeze and water provides optimum boiling and freezing point
protection for engines. An antifreeze concentration in excess of 60 percent must never be
used, except in arctic climates, since it increases the possibility of forming cooling system
gel, which results as silicates precipitate out of solution. However, an antifreeze
concentration of less than 40 percent increases the possibility of coolant freezing and liner
pitting. Therefore, Cummins Inc. recommends an antifreeze concentration range of 40 to
60 percent.
Fluids presently used in antifreeze are ethylene glycol, propylene glycol and glycerin.
Diesel engine antifreeze has primarily used ethylene glycol products because they are less
expensive than propylene glycol products. However, some applications require less toxic
coolant products and have driven the use of propylene glycol. The comparative properties
are similar for ethylene glycol and propylene glycol and are listed below. Properties of pure
water are shown for comparison. Properties of glycerin are similar to that of propylene
glycol. Glycerin is also non-toxic. Its properties are also in the table below.

Table 4 - Properties of Ethylene Glycol, Propylene
Glycol, and Glycerin Antifreeze versus Water
Property

Glycerin
(percent by