Q Why Can 1 Million Mile AFC Change Interval Claims Be Harmful To Your Engine? A Despite their eye-catching nature, recent claims of 1 million mile AFC change intervals aren't based on any new science or coolant formulation, they just imply that existing coolants now have the ability to offer as much as 67% more miles of engine and coolant-system protection. Therefore, operators of heavy duty vehicles shouldn't take at face value 1 million mile claims that could end up doing nothing more than putting their engines at risk. They should also be aware that while heavy duty engines have become increasingly more sophisticated in recent years, most coolant formulations have remained the same since the days when a 200,000-mile change interval was considered groundbreaking.
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