Power transmission fluids having enhanced performance capabilities

摘要

Power transmission fluids are described that have a Brookfield viscosity of 13,000 cP or less at -40 DEG C., a viscosity of at least 2.6 mPaxs at 150 DEG C. in the ASTM D-4683 method, and a viscosity of at least 6.8 cSt at 100 DEG C. after 40 cycles in the FISST of ASTM D-5275. This is achieved by use of particular base oil and additive components in specified proportions. Evaluations to date indicate that the compositions evaluated possess a combination of performance properties deemed necessary by an original equipment manufacturer for a new generation of electronically controlled automatic transmissions equipped with torque converter clutches capable of operating in a continuous slip mode.