MTL Manual Trans Lube- 1 Quart- 75W/80W GL-4

The REDLINE OIL MTL Manual Trans Lube 75W/80W GL-4 is a synthetic manual transmission fluid engineered for drivers who demand precision performance from their manual gearbox. This 1-quart bottle delivers the exact viscosity and protection specs required by most manual transmissions, making it essential for those restoring, upgrading, or maintaining high-performance and classic manual-shift vehicles. Whether you're a weekend warrior fine-tuning shift quality or a shop technician servicing fleets, this transmission fluid addresses the real friction and thermal challenges unique to manual clutch systems.

Formulated to GL-4 specification, this synthetic blend excels at protecting synchronizers and gear teeth under aggressive downshifting and sustained track use while maintaining film strength across a wide temperature window. The 75W/80W viscosity grade ensures smooth operation in cold climates without sacrificing film thickness under heat—critical for drivers who alternate between street and performance driving. Synthetic base stocks resist oxidation far longer than conventional mineral oils, extending drain intervals and preserving shift feel over time. The additive package controls foaming, reduces wear on brass synchronizer rings, and minimizes deposit buildup on internal components.

This product is ideal for vintage muscle cars, sport coupes, light trucks, and imported vehicles with manual five- and six-speed boxes that call for 75W80 fluid. Mechanics and enthusiasts appreciate its consistent shift feel and reduced notchiness compared to lower-grade alternatives. Always verify your transmission's OEM spec before filling—some applications require 75W90 or 80W90 instead. The 1-quart format suits top-ups and fluid changes on single-vehicle projects, while shops may prefer bulk supplies for higher-volume service. Store in a cool, dry location and reseal the bottle to prevent moisture absorption.