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blending ethylene glycol to create an “anti-freeze” mixture. The industry’s next challenge was that water corrodes the metal parts of an engine, so corrosion inhibitors were added to the anti-freeze mixture, to protect the engine. The glycol in the coolant can last for an extended period, but the
corrosion inhibitors deplete over time, leaving the engine un-protected from corrosive damage. So, the last great challenge for anti-freeze was how to extend corrosion protection. Up till now, the solutions to maintaining proper corrosion inhibitor levels have been to:
1) Flush, and refill the coolant in the entire system, which is costly and wasteful.
2) Add supplemental coolant additives, known as SCAs, which requires time, proper chemical monitoring and cost of the SCAs. or
3) move to extended life coolants, which last a long time and require no SCAs.
The conversion to extended life formulas has already occurred in the automotive world, where all O-E-Ms use extended life coolants as original fill. But when it comes to cooling, the heavy duty diesel world has its own unique challenges. Heavy duty engines compared to automotive engines ... go more than 10 times as far in a year, have 7 times the gross vehicle weight per HP, have an expected vehicle life of a million miles and a cooling system that has five times the volume. These factors put stresses on the coolant and create a unique challenges in maintaining proper coolant chemistry.
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