You need a Heavy-Duty Coolant but I dont think I would add I think I would change, make sure that it is the green if not talk to a Cummins rep.
A combination of 50/50 water and low silicate antifreeze (ethylene glycol or propylene glycol are acceptable). Antifreeze must meet ASTM 04985 (GM6038M) specs.
Fully formulated coolant must meet ASTM 06210 (EG) or ASTM 06211 (PG) specs.
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Walt & Will
2000 Dynasty
2017 Ram Big Horn Crew C 4X4 w/ M&G
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