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Should the acid value be higher or lower for lubricating oil?

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The acid value in lubricating oil should ideally be lower. A low acid value is crucial as it indicates minimal breakdown of triacylglycerols into free fatty acids, which can have detrimental effects like oxidation, spoilage, decreased quality, gum and sludge formation, and corrosion . Various methods have been developed to monitor and reduce the acid value of lubricating oil effectively. For instance, differential pulse voltammetric methods provide accurate measurements of acid value, overcoming the limitations of traditional titration methods . Additionally, refining methods involving the use of specific treatment agents and clay mixtures have been devised to reduce the acid value of lubricating oil stocks, ensuring compliance with quality standards at a lower cost . Therefore, maintaining a low acid value is essential for preserving the quality and performance of lubricating oil.

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Open access•Journal Article•DOI Acid Number Prediction Model of Lubricating Oil Based on Mid-Infrared Spectroscopy Fanhao Zhou, Kun Yang, Dayang Li, Xinfa Shi - Show less +3 more 29 Aug 2022-Lubricants 2 Citations	Lower acid value is preferable for lubricating oil. The study focuses on predicting acid number using infrared spectroscopy, emphasizing the importance of monitoring and maintaining optimal oil conditions.
Journal Article•DOI Acid Value of Various Domestic Uses Oil Suvasini Sharma, V.K. Jain - Show less +1 more 28 Jun 2015-Research Journal of Science and Technology 7 Citations	The acid value should be lower for lubricating oil. A high acid value indicates oxidation, leading to quality deterioration, gum formation, sludge, and corrosion in oils.
Patent Method for determining acid value in lubricating oil Li Yong, Liu Yunshan, Huang Shuiying, Zhang Xiaofeng, Yang Xiaofei, Chen Yao - Show less +5 more 22 Jul 2015 2 Citations	A higher acid value indicates more acidic components in lubricating oil, which can lead to increased corrosiveness. Lower acid values are preferred for better oil quality and equipment protection.
Patent Treatment method for reducing acid value of lubricating oil Sun Ruliu, Wang Jing, Guo Liang, Wang Yufei - Show less +3 more 29 Mar 2019	The acid value should be lower for lubricating oil. The treatment method using a specific polymer can effectively reduce the acid value, resulting in improved oil quality.

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