Someone makes a coolant that is supposed to function more efficiently than others, don't know the name, or if it is approved by Cummins.
If if were me, I'd focus on installing better sound-deadening insulation beneath the floor and dog-house engine cover.
2000 Winnebago Ultimate Freedom USQ40JD
, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert theConstitution. "Abraham Lincoln"