LUBRICANT FRICTION SCREENING-TEST

A novel technique for measuring very small variances in friction coeff icient due to a change in oil or additive type (with particular emphas is on hydraulic oils) is presented. A standard pin-on-disk tribometer is used for test oil friction measurement in comparison with a referen ce oil. The Oil Change Without Shutdown (OCWS) test procedure has been used to increase test precision and eliminate the baseline variations that are unavoidable with separate test measurements.