The acid value, iodine value, carbonyl value, the polymer, polar compounds, color, and viscosity of the oil stability index evaluation thereof. 以酸价、碘值、羰基值、聚合物、极性化合物、色泽以及粘度为指标评价了各油种的稳定性。
Base oil must be provided with the characteristic of oxidation stability, high viscosity index ( VI ), low volatility, and environment protection. 为适应其发展,基础油应具有优良的氧化安定性、高粘度指数、低挥发性、符合环保要求。