Originally Posted by SOJOURN4
I have a QSB 5.9 2011 w/220 hrs and thinking about changing to coolant and belts.
I think coolant change is a 600-hour (or X? years) maintenance item, for ours.
Cummins/Fleetguard offers a product called Restore that they recommend for flushing our freshwater (antifreeze) coolant systems, and I presume they recommend that for QSBs too.
Drain the old antifreeze, add Restore and bring temps up, drain the Restore, add fresh water and bring the temps up, drain that, add new coolant at the right dilution, burp the system, etc., done