Red Line 75W140 GL-5 Full Synthetic Gear Oil – 75W-140 | 1 Quart

Protect your high-performance differential with Red Line 75W140 — a full synthetic, polyol ester-based 75W-140 gear oil exceeding API GL-5 specifications. Engineered for heavily-loaded hypoid differentials, high-horsepower applications, and clutch-type limited slip differentials, Red Line 75W140 delivers exceptional thermal stability, shear resistance, and EP protection under the extreme heat and load conditions of track days, drag launches, and high-torque street builds.

Note: This formula contains friction modifiers — suitable for most clutch-type LSDs but not recommended for most manual transmissions, where friction modifiers can harm synchronizer function. For manual transmission use, see Red Line 75W140NS.

Key Features

• API GL-5+ Rated: Exceeds GL-5 specifications with robust extreme pressure (EP) additives for maximum protection of heavily-loaded ring and pinion hypoid gears
• Full Synthetic Polyol Ester Base: Polyol ester base stocks deliver phenomenal thermal stability and superior shear resistance compared to conventional synthetic gear oils — maintains protective film even when fluid temperatures spike during track use
• LSD Compatible: Contains sufficient friction modifiers to silence chatter and ensure optimal lock-up in most clutch-type limited slip differentials — often eliminating the need for separate LSD additives
• Extreme Temperature Range: Protective film maintained at high operating temperatures while remaining fluid down to -45°C / -49°F for cold-start protection
• Reduced Operating Temperatures: Ester base stocks and friction modifier package reduce sliding friction in hypoid gears, lowering differential operating temperatures and extending component life
• Broad OEM Compatibility: Meets or exceeds BMW SAF-XJ, Ford WSS-M2C940-A, and other heavy-duty GL-5 differential specifications

Specifications

• Type: Full Synthetic Gear Oil
• Base: Polyol Ester Synthetic
• Viscosity: 75W-140
• Volume: 1 Quart (~946ml)
• API Rating: GL-5+
• Friction Modifiers: Yes — LSD compatible
• Part Number: 57914

Note: Contains friction modifiers — not recommended for most manual transmissions where friction modifiers can harm synchronizer performance. For manual transmission applications requiring no friction modifiers, use Red Line 75W140NS (57104). Always verify your differential or transmission manufacturer's required specification before ordering.