Engine OEMs specify much shorter coolant change intervals. How do they determine coolants useful life?
Most engine companies specify two years as the expected maximum life of coolant. This is based on their “worst case” situation of contaminant buildup time. In reality, it is VERY conservative. Over 90% of engine coolants have a coolant life expectancy far beyond two years. Testing of coolant is the only sure way to know if the chemical condition dictates changing out.
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