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The Amsoil Series 2000 75W-90 synthetic has been a mainstay in high-performance gear lubes, but over the time we were in tests, it was replaced by the upgraded Severe Gear SAE 75W-90. The Series 2000 uses top-quality PAO (Poly-Alpha-Olefin) synthetic base stocks and has a pour point of -51 degrees, so it's great in any sort of cold weather above true Arctic conditions. It has a high Viscosity Index of 146, showing that it will retain its viscosity over a wide temperature. It does well in wear tests, having an 0.040mm scar diameter on the ASTM four-ball wear test. View Related Article
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