75W90
75W-90 is a multigrade gear oil specification used primarily in manual transmissions, transaxles, and many differentials. The designation consists of two numerals: 75W and 90. The “75W” part describes the oil’s cold-temperature viscosity and low-temperature performance, while the “90” describes its viscosity at high operating temperatures (around 100°C). The multigrade formulation helps the oil provide adequate lubrication across a wide temperature range and improves cold-start shifting compared with single-grade oils.
Base oils can be mineral, synthetic, or blends, and are combined with additive packages that typically include
Applications and compatibility: 75W-90 gear oils are commonly used in manual transmissions and transaxles in passenger
Standards and variations: Many 75W-90 products meet API GL-4 and/or GL-5 specifications, and some brands carry