ASTM D974 Acid Number Test - Key to Determining Lubricant Condition While Acid Number (AN) and Base Number (BN) should be run together in a limited number of circumstances, including testing lubricants for natural gas engines, they generally each have their own set of applications. Eurofins TestOil Analyst III Field Technician Matt McMahon explains,…
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ASTM D974 Acid Number Test—Key to Determining Lubricant Condition
