75W90NS Gear Oil 1 Quart

The 75W90NS Gear Oil 1 Quart by REDLINE OIL is a premium synthetic lubricant engineered for high-performance manual transmissions, differentials, and transfer cases that demand robust protection under extreme load. This 1-quart bottle delivers the viscosity and anti-slip characteristics required by modern drivetrain systems, particularly those specified with a non-slip (NS) additive package. Whether you're maintaining a street performance vehicle or keeping fleet equipment running reliably, this synthetic gear oil provides the thermal stability and film strength needed to withstand both highway and off-road conditions.

Redline's 75W90NS formulation uses advanced synthetic base stocks to maintain consistent viscosity across a wide temperature range—the 75W winter rating ensures cold-start pumpability, while the 90-weight hot rating protects gears at elevated operating temperatures. The NS (non-slip) additive package minimizes gear chatter and enhances synchronizer function, critical for smooth shifting and extended transmission life. Synthetic construction provides superior oxidation resistance, extending drain intervals and reducing sludge formation compared to conventional mineral oils. The formula also incorporates anti-wear and anti-corrosion additives, protecting ferrous and non-ferrous metals commonly found in modern drivetrain assemblies.

Technicians and serious enthusiasts choose 75W90NS gear oil for vehicles with limited-slip differentials, helical gears, or transmissions where OEM specifications explicitly call for non-slip properties. This 1-quart container is ideal for top-offs, small fleets, or as a convenient spare for emergency maintenance. Always verify your vehicle's factory service bulletin before use; some older or specialized differentials may require different viscosity grades or additive packages. Proper fill level directly affects cooling and lubrication efficiency, so check your owner's manual for the correct capacity and drain interval recommendations.