Red Line 75W140NS Non-Slip Gear Oil – 75W-140 | 1 Quart | API GL-5 / MT-1

Protect your high-performance manual transmission or racing differential with Red Line 75W140NS — a full synthetic, polyol ester-based 75W-140 gear oil engineered for applications where maximum friction is required. The NS (Non-Slip) designation means this formula contains the extreme pressure (EP) additives required for GL-5 protection but does not include friction modifiers — making it the ideal choice for performance manual transmissions requiring fast, precise synchronizer engagement and for clutch-type racing LSDs where maximum lock-up is desired.

Key Features

• NS (Non-Slip) Formula — No Friction Modifiers: Absence of friction modifiers allows synchronizers to reach equal speeds more quickly for faster, more precise shifting — eliminates the notchy feel common in high-performance manual gearboxes. Also provides maximum lock-up in clutch-type racing LSDs. Friction modifier can be added in precise doses to tune slip characteristics if desired
• Full Synthetic Polyol Ester Base: Polyol ester base stocks maintain consistent film thickness under extreme temperatures and heavy loading — superior shear stability and oxidation resistance compared to conventional synthetic gear oils
• API GL-5 / MT-1 Rated: Exceeds GL-5 and MT-1 specifications for broad compatibility with high-performance manual transmissions and differentials
• High-Temperature Stability: Engineered to reduce differential operating temperatures by 10–70°F compared to conventional gear oils — extending the life of gears, bearings, and seals during track days and high-load applications
• 75W-140 Viscosity: Heavy-duty viscosity grade for high-torque, high-load drivetrain applications

Common Applications

• Mitsubishi Evolution (VIII, IX, X), 3000GT VR-4, and DSM manual transmissions
• Clutch-type racing limited slip differentials (LSDs) requiring maximum lock-up
• Historic and vintage gearboxes (1930s–1950s) requiring SAE 140 weight with synchro compatibility
• Problematic transmissions such as the Dodge/Plymouth A-833 4-speed

Specifications

• Type: Full Synthetic Gear Oil (Non-Slip)
• Base: Polyol Ester Synthetic
• Viscosity: 75W-140
• Volume: 1 Quart (~946ml)
• API Rating: GL-5 / MT-1
• Friction Modifiers: None (NS — Non-Slip)
• Part Number: 57104

Note: NS formula contains no friction modifiers — provides maximum synchronizer friction and LSD lock-up. If reduced LSD slip is desired, Red Line friction modifier can be added in small doses. Always verify your transmission or differential manufacturer's required oil specification before ordering.