Why is the OEM OAT coolant marketed as 10 yr / 150,000 miles then? Additionally.....Peak offers coolant in OAT called Final Charge, if one needs some on a day when the dealership is closed or is far away. This coolant was discovered early on by a few guys over on cumminsforum.com in RAM Cummins applications.quote]
What does your owner's manual say? That is what you should go by. My 2009 SRT uses HOAT antifreeze and must be changed every 5 years or 150,000 miles, whichever comes first.