On average, engine coolants have to undergo thirty different tests before they are approved by the engine manufacturers. New vehicles are filled with approved engine coolants when they leave the factory and these can be replaced during the warranty period without affecting the manufacturer’s warranty. Vehicle manufacturers do not “recommend” any particular engine coolants, but they do grant official approvals. What are the advantages of coolants that have been officially approved by vehicle manufacturers? This prevents rust, contamination and suspended particles remaining in the system leading to scale, corrosion and other damage. It is also strongly recommended to clean the cooling system and completely renew the coolant whenever the cooling system is repaired. We therefore recommend a complete change of coolant every three to four years. In the cooling system, pH buffers and additives are gradually degraded and become less effective with time. The topics are covered by BASF's glysantin website question and answer section Ī couple of quotes:- How often do coolants have to be changed? Comma's figure of 5 years is perhaps the opposite- a worst case scenario- they have to quote for a wide variety of vehicle manufacturers using different coolant system materials and perhaps water of varying quality /hardness/pH and whose coolant systems may be past their best.
In other words the 15 year coolant lifequoted is particular to given set of circumstances pertinent only to its use in certain MB vehicles under what you might term ideal conditions. I'm going to venture that an MB 15 year cycle is a best case factory fill scenario with a "virgin"cooling system composed of corrosion resistant materials and using a 50/50 mix of de-ionised / distilled water to maintain a neutral coolant pH.
Third- the possible engineering answer- that coolant life is dependant on many factors including resistance to thermal breakdown and corrosion which in turn is going to be heavily dependant on the antifreeze pH, the pH of the water its mixed with, and the resistance to corrosion of the vehicle surfaces its going to come in contact with. Second the MB marketing men answer - because MB branded coolant 235.6 is sprinked with magic fairy dust -this despite containing the same BASF GLYSANTIN SI-OAT technology that the other coolant manufacturers offer. First the G48 only meets an old MB approval so can be comfortably removed from the discussion
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