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依据GB／T3142和GB／T12583试验方法，测定了31种试油的PB、PD、ZMZ，建立了两种试验方法测定结果之间的相关公式，其相关系数均大于0．93，并分析了造成两种方法试验结果不同的原因。
According to GB / T3142 and GB / T12583 test methods, PB, PD and ZMZ of 31 kinds of test oils were determined, and the correlation formulas between the two test methods were established. The correlation coefficients were all greater than 0.93, Cause two methods test results for different reasons.