MT-LV GL-4 Gear Oil 1Qt.

The MT-LV GL-4 Gear Oil 1Qt. from REDLINE OIL is a purpose-built synthetic lubricant engineered for manual transmissions and differentials that demand superior film strength and thermal stability. This product exists because factory gear oils often fall short in high-stress applications—whether you're running aggressive gear ratios, frequent towing, or pushing your vehicle through spirited driving conditions. Mechanics and performance enthusiasts choose REDLINE's MT-LV formulation to protect synchronizers, gears, and bearings under extreme pressure and temperature swings that conventional oils cannot handle.

REDLINE's MT-LV GL-4 achieves its robust performance through advanced synthetic base stocks and a carefully balanced additive package that minimizes friction while maintaining a durable protective layer on gear teeth and bearing surfaces. The GL-4 specification ensures compatibility with brass synchronizers—critical for manual transmissions—while the low-viscosity formulation reduces drag and heat generation during normal operation. This gear oil resists shear, meaning it won't thin out under the brutal grinding and sliding forces inside a transmission case, maintaining its protective viscosity from cold starts through sustained highway cruising and track use. The 1-quart size allows targeted top-ups or complete fluid changes in compact differentials and smaller transmission systems.

Drivers upgrading to performance gearbox setups, builders working on modified or restomod manual transmissions, and mechanics servicing high-mileage vehicles will see the most benefit from switching to MT-LV GL-4. It pairs exceptionally well with manual transmissions that have seen internal upgrades—straight-cut gears, upgraded synchronizers, or lightened components—where OEM fluid specifications fall short. Always verify your vehicle or component manufacturer's approval for GL-4 before installation, as some systems specify GL-5; however, GL-4's brass-safe chemistry makes it the go-to choice for most classic and modern manual boxes. Store the sealed quart at moderate temperature for maximum shelf life.