Wear-preventing property of used gasoline engine oils

Abstract Wear experiments were conducted with used gasoline engine oils as the lubricants. Several oil samples were obtained from gasoline engines run under various conditions. Friction and wear properties of the oils were determined and are discussed in connection with some of their chemical characteristics, such as total acid number (TAN), total base number (TBN) and absorbance of IR spectra by specific chemical groups. The results obtained show that friction and wear properties of used engine oils change considerably with their degree of deterioration. The wear rate increases sharply when the increase in TAN above the initial value exceeds about 1 mgKOH g−1. However, wear is minimized if TBN is larger than about 2 mgKOH g−1 when determined by the HCl method.

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