Found it! Thanks for this information. I'll have to cross reference the wix coolant filter to see if fleet-guard has an equivalent. Cummings has done a decent job at accommodating different markets. I see that the rv builders are starting to put in the 6.7L in the motor home's now.Molybdate is part of the equation, but mainly it's a couple of the organic acids in the formulation...benzoic and sebacic. Those are both designed to protect iron and aluminum components.