1.1本试验方法涵盖了在285℃下，在氧化和催化条件下，将8.5 g发动机机油以薄膜形式在杆上重复通过，以确定特殊构造的试验杆上形成的沉积物质量的程序 ° C、 根据实验室间研究得出的中高温热氧化发动机试验（TEOST MHT）试验方法的适用范围约为10至100 mg。然而，经验表明，可以获得1到150 mg或更大的沉积物值。 1.2本试验方法使用可追溯至制造商的专利仪器、方法和专利、编号和注册的沉积棒，并专门为试验方法的实践和精度而制造。 1.3以国际单位制表示的数值应视为标准值。 本标准不包括其他计量单位。 1.3.1以国际单位制表示的数值应视为标准值。虽然不是国际单位制单位，但国际单位制允许使用升（L）这个特殊名称表示立方米（dm） 3. )对于国际单位制立方厘米（cm），单位为毫升（mL） 3. ). 1.4 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====== 该测试方法旨在预测发动机机油在活塞环皮带和上活塞顶区域中的沉积物形成趋势。TEOST MHT程序和TU3MH标致发动机测试在沉积物形成方面存在相关性。 在往复式发动机活塞的环形皮带区域形成的此类沉积物可能会导致发动机运行和寿命问题。这是规范D 4485中要求的试验方法之一 定义API类别确定的发动机机油。

1.1 This test method covers the procedure to determine the mass of deposit formed on a specially constructed test rod exposed to repetitive passage of 8.5 g of engine oil over the rod in a thin film under oxidative and catalytic conditions at 285 ° C. The range of applicability of the Moderately High Temperature Thermo-Oxidation Engine Test (TEOST MHT ) test method as derived from an interlaboratory study is approximately 10 to 100 mg. However, experience indicates that deposit values from 1 to 150 mg or greater may be obtained. 1.2 This test method uses a patented instrument, method and patented, numbered, and registered depositor rods traceable to the manufacturer and made specifically for the practice and precision of the test method. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3.1 The values stated in SI units are to be regarded as standard. Although not an SI unit, the special name, litre (L) is allowed by SI for the cubic decimetre (dm 3 ) and the millilitre (mL) for the SI cubic centimetre (cm 3 ). 1.4 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 ====== The test method is designed to predict the deposit-forming tendencies of engine oil in the piston ring belt and upper piston crown area. Correlation has been shown between the TEOST MHT procedure and the TU3MH Peugeot engine test in deposit formation. Such deposits formed in the ring-belt area of a reciprocating engine piston can cause problems with engine operation and longevity. It is one of the required test methods in Specification D 4485 to define API Category-Identified engine oils.