HIGH-TEMPERATURE / HIGH-SHEAR TEST (ASTM D5481)
HIGH-TEMPERATURE / HIGH-SHEAR TEST (ASTM D5481) simulates shearing conditions at elevated temperatures. The viscosity of the oil is measured at 302 F (150 ° C) under shearing forces, and results are reported in centipoise (cP). The higher the test result, the greater the level of protection offered by the oil. A temperature of 302 ° F (150 ° C) is necessary because bearings and other components require the greatest protection during high-temperature operations.
AMSOIL Advantage re: HIGH-TEMPERATURE / HIGH-SHEAR TEST
AMSOIL Advantage Stable Viscosity AMSOIL synthetic lubricants maintain viscosity under extreme temperature fluctuations and shearing forces; they meet requirements set forth for multi-viscosity oils requiring a minimum oil viscosity. Whereas some conventional mineral oils degrade when exposed to high temperatures and high forces,
AMSOIL synthetic lubricants offer superior wear protection in extreme temperatures. AMSOIL synthetic lubricants are inherently better at maintaining viscosity over a wide temperature range (high VI), and, coupled with shear-stable VI improvers, they maintain viscosity characteristics better at high temperatures and for longer durations than conventional oils.
OilBuddy’s Take
In other words, the higher the test result, the greater the level of protection. Due to the fact that the oil does not degrade when exposed to high temperatures and high shear forces. Essentially, the viscosity characteristics are maintained at high temperatures.
