Eaton’s Viscosity Grade Change

Over the years, performance demands of heavy-duty truck transmissions diverged from diesel engines and created the need for specializing the fluids. In response to this, Eaton Corporation, original equipment manufacturer (OEM) of transmissions, created the PS-164 specification. 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. This new specification also…

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