
Lubricant Shear Stability Under High Load: A Decision Framework for PSSI, SSI, and Viscosity Modifier Selection
Shear stability is not a 'higher is better' metric. This decision framework shows fleet managers, mechanics, and distributors how to interpret PSSI/SSI values, match viscosity modifier chemistry to load regimes, and avoid the 20% viscosity loss that costs more than fuel savings.
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