Hello. New owner of a 2015 Fleetwood Discovery 40E 

I have an appointment with Cummins Orlando next week to have the 380 HP ISL9 motor upgrade to 450 HP and coolant Flush and fill with OAT coolant.  Cummins said it is set for 6 hours to do the flush and fill.  Does this seem reasonable? Just wondering.  We have no maintenance records and we want to make sure the coolant is high quality and up to date.  Thank you  from Oviedo FL 

Anthony McCool wrote:

6 hours to swap out, does seem a little excessive. I would think more like 2 hours.