Where do you guys come up with this foolishness that testing the coolant has anything to do with the radiator failures? It is all about nitrites which can affect head gaskets and many other internal parts but it has nothing to do with the plastic radiator tank failure.
You Dmax guys may want to read up a little before you crow too much. Our fleet of Dmax powered pickups has experienced quite a few head gasket issues and the general consensus has been that the coolant was not properly maintained. All modern diesel engines are sensitive to nitrite formation in the coolant and vulnerable to subsequent problems. It is far less of an issue with the Cummins, but they are not immune.
