Owners manual

Coolant Recommendations and Specifications QSB4.5 and QSB6.7
Page V-14 Section V - Maintenance Specifications
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
)