99blackrig

I have about 60,000 miles on my truck and the radiator fluid has never been changed. I don't have any problems with temps. I popped the cap today and the fluid is all the way to the top and the resovior is half full.

Should I flush and change the fluid?

displacedtexan

I would if I were you. I worry more about corrosion/freeze protection from the coolant than temps. Pure water would do better at displacing heat, but corrosion and reducing the freeze point are the main purpose of the "coolant".

Evans makes the best stuff out there for your radiator IMHO, but it aint cheap.

GSP

Change it. Dont know its a wives tail but , antifreeze gets alittle acidic after 3 or 4 years. Could be marketing B.S. But its good to flush and replace it.

supr

Change it! Get the antfreeze that says it meets the Cummins spec. NAPA's does.
There is an additive fro NOROISION.com that allows you to go 5 years on the normal coolant, keeping it from going acidic. I put it in all my vehicles. They also sell a test kit to check key coponent levels. I am going to do mone in another month or 2.