Redline 75W140NS GL-5 Gear Oil, Quart (946ml)

Redline 75W140NS GL-5 Gear Oil (Quart)

This Redline 75W140NS gear oil is the “no-slip” version of Redline’s 75W140 GL-5 gear oil. It uses the same extreme-pressure protection but leaves out the friction modifiers. That makes it the right choice for clutch-type limited-slip differentials in racing. There, you want maximum lock-up rather than a smoothed-out LSD feel. Racers who want to fine-tune slip can still add Redline’s Limited Slip Friction Modifier separately, in small doses. That flexibility lets you dial in exactly the amount of lock-up you want. You’re not stuck with a pre-blended friction package.

Vintage and Historic Gearbox Use

Because it’s non-corrosive and safe with all synchro materials, this oil is also popular in historic and vintage synchro-equipped gearboxes. That includes 1930s–1950s transmissions and the notoriously noisy A-833 Dodge/Plymouth 4-speed. If you need to raise the viscosity in a noisy transmission, you can mix it with Redline’s 75W90NS or MT-90. Red Line builds it on the same polyol ester base stock as the standard 75W140. As a result, it still delivers strong film strength and shear stability under sustained heat and load. That holds true even without the friction modifier package. This combination of strength and non-corrosive chemistry is why so many restorers trust it in gearboxes with original yellow-metal synchros.

Typical Properties:

• API Service Class: GL-5+
• SAE Viscosity Grade: 75W140
• Viscosity @ 100°C: 26.9 cSt
• Viscosity @ 40°C: 162 cSt
• Viscosity Index: 200
• Pour Point: -45°C / -49°F
• Brookfield Viscosity: 1200 poise @ -40°C

This quart bottle suits a top-up or partial refill depending on your differential’s or gearbox’s capacity. A Gallon size is also available for larger housings. It’s also handy for keeping spare oil on hand for race day. Not sure whether you need the standard 75W140 or this Redline 75W140NS gear oil? Get in touch and we’ll help you choose. For the full technical data sheet, see Redline’s official product page.