Red Line 75W140 GL-5 Synthetic Gear Oil - 1 Quart

Red Line 75W140 GL-5 Synthetic Gear Oil - 1 Quart

Maximum Film Strength for Heavy-Duty and Racing Differentials

Give your high-stress drivetrain the protection it deserves with Red Line 75W140 GL-5. This lubricant is specifically formulated for late-model trucks, SUVs, and high-horsepower performance cars that require a heavier 140-weight fluid to manage extreme operating temperatures. Unlike conventional oils that can thin out and allow metal-to-metal contact, Red Line’s polyol ester base stocks maintain their viscosity and lubricating power under the most punishing conditions. It comes pre-balanced with the necessary friction modifiers for limited-slip systems, ensuring quiet operation and smooth locking performance right out of the bottle.

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

- Superior Film Strength: The ester-based formula provides a thicker, more resilient oil film at high temperatures compared to petroleum-based or Group III synthetic 75W140s.

- Integrated Friction Modifiers: Contains the specific additives required for Limited-Slip Differentials (LSD), eliminating gear "chatter" and noise without needing extra supplement bottles.

- Extreme Temperature Range: Engineered to flow exceptionally well in freezing temperatures while providing "140-grade" protection during high-heat towing or track sessions.

- Reduced Wear & Friction: High lubricating power helps lower differential operating temperatures, extending the life of seals, bearings, and gear teeth.

- Shear Stability: Resists mechanical breakdown even under heavy shock loads, ensuring consistent protection between service intervals.

Product Specifications

- Part Number: 57914

- Viscosity Grade: SAE 75W-140

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

- Viscosity at 100°C: 26.9 cSt

- Viscosity Index: 192

- Flash Point: 224°C / 435°F

- Pour Point: -45°C / -49°F

Precision Tip: This is a GL-5 rated fluid designed for differentials. Due to the extreme-pressure additives and high viscosity, it is generally not recommended for manual transmissions unless specifically called for by the manufacturer. While it includes LSD additives, some extremely sensitive "clutch-type" differentials may still require a small amount of additional Red Line Limited Slip Friction Modifier if you experience chatter during tight turns.