Cobra21 wrote:
Each anti freeze has their own life span. GM uses Dex Cool, I think it had a 10 year 100,00 mile life. They state it on the container and should be followed or yes they can turn acidic. They used to make a can of water pump lube that would neutralize your antifreeze to keep it from turning acidic.
DexCool meets the Ford specs for 6.7 diesel engines, same stuff at 1/3 of the Ford price. Ford does have an additive to revitalize the coolant, or just change it out and be good for years to come.
Of course, always read the manual.