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We have diesels that have been worked hard and have 10,000 plus hours on them with the same coolant. The additive is a process that increases your pH of your coolant to insure that it does not attack the cylinder liners, called "pitting". We have used this with great sucess on our older Ford diesels; the John Deere diesels and the International Harvester diesels (Ag).
If you ever have your coolant changed, ensure the tech uses demineralized water for mixing as the majority of time they just use tap water with a hardness level of anywhere from 100 to 200 ppm plus. Guess where all these impurities end up in your engine at high temps? On the cylinder walls causing all kinds of chemical reactions and impeding efficiency.
To conclude: If your cooling system is sealed and is of good quality from day one and never breaks down why tamper with it. Where things go wrong, is when someone tops up the level with inferior coolant or water and that starts the process of breakdown. If you test the coolant for ph and use the additive as directed the coolant will retain it strength and chemical makeup for many years. We have about 15 diesel engines (automotive and Ag) on our farm and we continue to use this process and have never had any liners or cylinders attacked. Ellis
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