Red Line 75W90 GL-5 Synthetic Gear Oil - 1 Quart

Red Line 75W90 GL-5 Synthetic Gear Oil - 1 Quart

Maximum Film Strength and Thermal Stability for High-Load Drivetrains

Give your vehicle the ultimate defense against friction with Red Line 75W90 GL-5. Formulated with polyol ester base stocks—the same high-performance chemistry used in jet engines—this gear oil offers exceptional film strength and shear stability. Unlike standard lubricants that thin out when they get hot, Red Line maintains its viscosity to prevent metal-to-metal contact. It’s specifically designed for hypoid gear sets in passenger cars and light trucks, providing the extreme pressure (EP) protection required by API GL-5 standards while simultaneously improving efficiency and reducing operating temperatures.

What’s Included in the Box:

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

The Red Line Advantage

- Polyol Ester Base Stocks: Provides an unshearable oil film and superior heat resistance compared to petroleum or Group III synthetics.

- Integrated Friction Modifiers: Pre-mixed with the necessary additives for Limited-Slip Differentials (LSD), eliminating gear "chatter" without the need for additional supplement bottles.

- Extreme Pressure (EP) Protection: Designed to handle high-torque loads and heavy shock impacts common in performance and towing applications.

- Superior Cold Flow: The high viscosity index ensures the fluid remains fluid in freezing temperatures, allowing for immediate protection and easier shifting during cold starts.

- Lower Operating Temps: High lubricating power significantly reduces internal friction, which helps dissipate heat and extends the life of your seals and gears.

Product Specifications

- Part Number: 57904

- Viscosity Grade: SAE 75W-90

- Standard: API GL-5, GL-6, MT-1, MIL-L-2105E

- Flash Point: 221°C / 430°F

- Pour Point: -45°C / -49°F

- Viscosity at 100°C: 16.4 cSt

- Viscosity Index: 155

Precision Tip: This fluid contains friction modifiers intended for Limited-Slip Differentials. If you are using this in a manual transmission and find the shifts feel "too slippery" or the synchronizers are struggling to grab, you may prefer Red Line 75W90 NS (Non-Slip), which is the same high-quality oil but without the friction modifiers. For most rear differential services, we recommend having 2 to 3 quarts on hand to ensure a complete fill.