The principal object of this invention is to provide novel supplemental coolant additive compositions to be used in the cooling systems for diesel engines to improve the performance and extend the operating life thereof plus reduce maintenance costs associated with diesel engine cooling systems.
In a typical on-highway heavy duty diesel engine cooling system, flow rate can range from 80 to 150 gallons per minute. This means that flow velocities can reach 8 to 10 feet per second. Tests have shown that solder and aluminum are sensitive to the effects of high flow rate.
This invention provides a composition adapted for use in heavy duty diesel engine cooling systems to achieve the foregoing objects. The composition of this invention is adapted for admixture with conventional antifreeze compositions used in automotive engine cooling systems. The composition comprises:
Historically, antifreeze compositions have been formulated to meet the coolant needs of automobiles but have not satisfactorily met the needs of a diesel engine. Accordingly, supplemental coolant additives are added to the diesel engine cooling system initially to make up for the deficiencies of the antifreeze solutions customarily used. Supplemental coolant additives are also added to the cooling system at each oil change to replace additives lost due to dilution and additive depletion.