![]() ![]() Then, engine fluids began requiring multi-viscosity grades such as SAE 15W-40. Additionally, Eaton wanted customers to adopt the gear fluid naming convention i.e., SAE 75W-90, to distinguish transmission fluids from engine fluids.īefore the 1980’s, it was commonplace to use monograde fluids such as SAE 40 and 50 in diesel engines and manual transmissions. This new specification also required backwards compatibility for ease of transition. Then in 2017, they demanded more robustness from transmission fluids and replaced PS-164, revision 7, to PS-386 for increased fuel economy, extended drain intervals up to 500,000 miles and enhanced durability for gear and bearing protection in extreme temperatures. In response to this, Eaton Corporation, original equipment manufacturer (OEM) of transmissions, created the PS-164 specification. ![]() Over the years, performance demands of heavy-duty truck transmissions diverged from diesel engines and created the need for specializing the fluids. ![]()
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