ASTM D8665-26

1.1 This test method covers the determination of the tendency of a fully formulated automotive engine oil to form a precipitate that causes an abrupt viscosity increase due to gelation. It simulates a problem that may be encountered after multiple cold starts or short drive times, resulting in a buildup of water contamination in the oil. After long storage periods, gelation of the oil/water/precipitate mixture can be observed. This method addresses contamination containing a weak acid formation from carbon dioxide; it does not directly address other forms of gel formation. The test result (average of duplicates) of interest is the Oil Volume (mL) at 120 seconds (V120) in the test, with results between 5 mL and 68 mL.

1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.