Abstract: The friction and wear behavior of GF-5 0W-20 engine oil, A5/B5 0W-30 engine oil with organic molybdenum FM or organic amine FM were measured by SRV friction and wear test machine and high frequency reciprocating rig (HFRR) under different conditions. The results were verified by engine torque test after addition of FM. The test results show that FM’s friction performance can be distinguished by SRV and HFRR; the addition of appropriate amount of FM can reduce the friction coefficient of gasoline engine, engine friction loss and torque, improve the fuel economy. The results of SRV and HFRR test are well consistent with the results of engine torque test.

Key words: friction modifier, gasoline engine oil, fuel economy, consistency