Owners manual

QSB4.5 and QSB6.7 Coolant Recommendations and Specifications
Section V - Maintenance Specifications Page V-15
Cummins Inc. recommends using Fleetguard® Compleat.
It is available in both glycol forms (ethylene and
propylene).
Fully formulated antifreeze must be mixed with good-
quality water at a 50/50 ratio (40- to 60-percent working
range). A 50/50 mixture of antifreeze and water gives a
-36°C [-33°F] freezing point and a 108°C [226°F] boiling
point, which is adequate for locations in North America.
The actual lowest freezing point of ethylene glycol
antifreeze is at 68 percent. Using higher concentrations of
antifreeze will raise the freezing point of the solution and
increase the possibility of a silica gel problem.
Legend
1 Freezing Point Temperature Scale
2 Boiling Point Temperature Scale