Fleetguard-Nelson, a subsidiary of Cummins Engine Company, has developed several products. Their older products closely resemble Pencool, so we will discuss the different technology here. The key to preventing problems rests in the extra chemical stabilizers formulated into the package by Fleetguard as well as education to prevent improper use and over dose situations. The DCA-4 package uses nitrite and molybdate together to prevent cylinder liner cavitation. Fleetguard supports the position that a synergy exists by publishing several SAE papers on the subject.
Many loyal customers suggest that it works as well.
The advantage of lower nitrite concentrations is that, in laboratory testing, solder corrosion increases measurably as nitrite concentration increases. There are many imitators of the principle brands. Some fleet customers report that these other brands may omit some components to reduce cost. Meanwhile, of course, the rest of the cooling system suffers. Both Penray and Fleetguard-Nelson now have practices in place that can eliminate scheduled coolant changes in heavy trucks.