75W90 Gear Oil 1 Quart

The 75W90 Gear Oil 1 Quart from REDLINE OIL is purpose-built for high-performance differential and transmission applications where extreme pressure and heat demand superior film strength. Whether you're running a modified street machine, a track-focused build, or managing heavy-duty towing, this synthetic formulation protects gears under the punishing loads that come with aggressive driving. A single quart serves as an excellent top-up for partial changes or works as part of a complete fluid refresh to maintain your drivetrain's integrity.

REDLINE's 75W90 employs advanced synthetic base stocks and extreme pressure additives that cling to gear teeth under maximum shear stress, preventing metal-to-metal contact and wear. The 75-weight winter rating ensures cold-start pumpability in winter climates, while the 90-weight summer rating delivers the viscosity needed to maintain a protective barrier during sustained high-load operation. This balanced viscosity profile resists viscosity breakdown from heat cycling—critical for turbocharged applications, superchargers, or any build where transmission or differential temperatures routinely exceed 200°F.

This fluid is ideal for limited-slip differentials, helical gearsets, and performance manual transmissions found in modern sports cars, muscle cars, and modified trucks. Check your owner's manual or transmission builder's specification sheet—most modern performance differentials and gearboxes either require or strongly benefit from a premium synthetic 75W90. The 1-quart convenient size is perfect for topping off after service, storing in your shop for emergencies, or combining with additional quarts for a complete drain-and-fill maintenance interval.