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本文通过对EQ140车用发动机润滑油15W／40SD的试验研究，应用模糊数学建立了一种实用的车用发动机润滑油性能评价数学模型，为指导用户合理确定换油期提供了科学依据。
Based on the experimental research on the 15W / 40SD engine lubricating oil for EQ140 vehicle, a mathematical model of the performance evaluation of the lubricating oil for the engine of a vehicle is established by using fuzzy mathematics, which provides a scientific basis for guiding the user to determine the oil change period reasonably.