EFFECT OF LUBE BASE OIL ON ENGINE OIL TEOST 33C DEPOSITS

Abstract

Abstract: The main sources and chemical composition of TEOST 33C deposits, and the base oil properties influence on the TEOST 33C deposits were studied. The results show that TEOST 33C deposits formed mainly from the additives, mainly composed of oxygenated hydrocarbon compounds, also contain a small part of nitrides, calcium sulfate, phosphate, MoS₂, MoO₂ and molybdate.Base oil has a great influence on the amount and composition of TEOST 33C deposits.The TEOST 33C deposits weight from the oil containing HVIⅠ150 base oil is less than the oil containing HVI Ⅱ 4, HVI Ⅱ⁺ 4, or HVI Ⅲ 4 base oils. TEOST 33C deposit weight decreases as the base oil viscosity increases. HVI II 10 base oil greatly reduce the weight of TEOST 33C deposits. Increasing the polarity of base oil conduce to reduce the weight of TEOST 33C deposits.

Key words: thermal oxidation, base oil, deposits, XPS

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EFFECT OF LUBE BASE OIL ON ENGINE OIL TEOST 33C DEPOSITS

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