Operation and maintenance manual

QSB4.5 and QSB6.7 Coolant Recommendations and Specifications
Section V - Maintenance Specifications Page V-13
Coolant Recommendations and
Specifications
Fully Formulated Coolant/Antifreeze
Cummins Inc. recommends the use of fully formulated
antifreeze/coolant meeting Cummins Engineering
Standards (C.E.S.) 14603. For further details and
discussion of coolant for Cummins® engines, refer to
Coolant Requirements and Maintenance, Bulletin
3666132.
Typically, antifreeze/coolants meeting ASTM4985
(GM6038M specification) or ASTM D6210 criteria are
acceptable antifreeze/coolants for engines covered by the
manual.
Low-silicate antifreeze/coolants meeting ASTM D4985
(GM6038M specification) are not adequate for extended
service intervals.
Cummins Inc. recommends using either a 50/50 mixture
of good-quality water and fully formulated antifreeze, or
fully formulated coolant when filling the cooling system.
Good-quality water is important for cooling system
performance. Excessive levels of calcium and magnesium
contribute to scaling problems, and excessive levels of
chlorides and sulfates cause cooling system corrosion.
Water Quality
Calcium Magnesium
(hardness)
Maximum 170 ppm as
(CaCO
3
+ MgCO
3
)
Chloride 40 ppm as (CI)
Sulfur 100 ppm as (SO
4
)
Cummins Inc. recommends using Fleetguard® Compleat.
It is available in both glycol forms (ethylene and
propylene).