1.1 ,This test method covers a procedure for determining a lubricating grease's coefficient of friction and its ability to protect against wear when subjected to high-frequency, linear-oscillation motion using an SRV test machine at a test load of 200 ,N, frequency of 50 ,Hz, stroke amplitude of 1.00 ,mm, duration of 2 ,h, and temperature within the range of the test machine, specifically, ambient to 280 ,°,C. Other test loads (10 ,N to 1200 ,N for SRVI-model, 10 ,N to 1400 ,N for SRVII-model, and 10 ,N to 2000 ,N for SRVIII-model), frequencies (5 ,Hz to 500 ,Hz) and stroke amplitudes (0.1 ,mm up to 4.0 ,mm) can be used, if specified. The precision of this test method is based on the stated parameters and test temperatures of 50 ,°,C and 80 ,°,C. Average wear scar dimensions on ball and coefficient of friction are determined and reported.