Red Line MT-85 75W85 GL-4 Synthetic Gear Oil - 1 Quart

Red Line MT-85 75W85 GL-4 Synthetic Gear Oil - 1 Quart

The "Goldilocks" Solution for Modern Manual Transmissions

Bridge the gap between too thin and too thick with Red Line MT-85. This 75W85 GL-4 gear oil is the go-to upgrade for vehicles like the Hyundai Genesis Coupe, Mitsubishi Evolution, and various Nissan and Toyota models that specify this exact viscosity. Formulated with polyol ester base stocks, it provides an exceptionally strong oil film that protects gear teeth under heavy load while remaining fluid enough to allow for effortless shifting in freezing temperatures. Because it is a dedicated GL-4 fluid, it contains no reactive sulfurs, making it 100% safe for the brass and bronze synchronizers found in high-performance gearboxes.

What’s Included in the Box:

- (1) 1 Quart (0.946L) Bottle: Standard neck design compatible with most common fluid transfer pumps.

The Red Line Advantage

- Perfect Shift Feel: Specifically balanced friction levels allow synchronizers to slow down and lock gears quickly, reducing shift effort and eliminating "crunchy" gear changes.

- Yellow Metal Safety: Formulated without the corrosive sulfur additives found in GL-5 oils, ensuring your internal brass synchronizers don't degrade over time.

- Ester-Based Stability: Provides superior film strength and thermal stability, maintaining its protective qualities even during the high-heat cycles of track days.

- Extreme Cold Fluidity: Offers significantly better cold-weather shifting than standard factory fluids, protecting your transmission from the moment you move.

- Reduced Internal Drag: The optimized 75W85 viscosity reduces "churning losses" within the gearbox, which can improve both fuel economy and power delivery.

Product Specifications

- Part Number: 50504

- Viscosity Grade: SAE 75W85

- Standard: API GL-4, GL-3, GL-1

- Viscosity at 100°C: 12.0 cSt

- Viscosity Index: 172

- Flash Point: 236°C / 457°F

- Pour Point: -45°C / -49°F

Primary Vehicle Compatibility

- Hyundai / Kia: Many models requiring 75W85 GL-4 (Genesis Coupe, Veloster, etc.)

- Mitsubishi: Lancer Evolution and other manual transaxles

- Nissan: Many modern 6-speed manuals (350Z/370Z, Frontier, etc.)

- Toyota: Select models requiring 75W85 GL-4

Precision Tip: MT-85 is a GL-4 rated fluid, specifically designed for manual transmissions and transaxles. It does not have the extreme-pressure additives required for most hypoid rear differentials (which usually require GL-5). If your car specifies 75W85 for the gearbox, this is your performance upgrade. Most manual gearboxes will require between 2 and 4 quarts for a complete service.