1.1本试验方法包括测定极压和非极压齿轮油的氧化特性，并包括定量测定总污泥、粘度变化和油损失。 笔记 1-虽然循环试验使用ISO VG 220极压齿轮油来开发精度数据，但该试验方法可以扩展到其他粘度等级和非极压齿轮油。参见分类D 2422 粘度等级。 1.2以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。 本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 ====意义和用途====== 齿轮油因氧化或热分解而降解，或两者兼而有之，可能导致油泥堆积，使其不适合进一步用作润滑剂。 这是唯一一种使用玻璃器皿测量氧化和热降解过程中产生的污泥量的测试方法。本试验方法是对试验方法D 2893的修改 它测量了95℃下应力油的粘度增加和沉淀数 ° C、 但不测量形成的污泥量。 该试验方法可用于评估齿轮油的氧化/热稳定性。然而，试验结果可能与现场使用的齿轮油性能无关。

1.1 This test method covers the determination of the oxidation characteristics of extreme pressure and non-extreme pressure gear oils and includes the quantitative determination of total sludge, viscosity change, and oil loss. Note 1—While the round-robin tests used ISO VG 220 extreme pressure gear oils for developing precision data, the test method can be extended to other viscosity grades and to non-extreme pressure gear oils. Refer to Classification D 2422 for viscosity grades. 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 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 and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== Degradation of gear oils by oxidation or thermal breakdown, or both, can result in sludge buildup and render the oil unsuitable for further use as a lubricant. This is the only test method that employs glassware to measure the amount of sludge produced during oxidation and thermal degradation. This test method is a modification of Test Method D 2893 which measures the viscosity increase and precipitation number of the oil stressed at 95 ° C, but does not measure the amount of sludge formed. This test method can be used to evaluate the oxidation/thermal stability of gear oils. However, the test results may not correlate with the performance of gear oils in field service.