Red Line 75W90NS GL-5 Gear Oil

Product information

Red Line 75W90NS is a fully synthetic GL-5 gear oil developed for manual transmissions and transaxles that require strong hypoid-gear protection without the additional slipperiness of a limited-slip friction modifier. We advise the NS variant in Torsen differentials and gearboxes.

The “NS” stands for non-slip. Its higher friction level helps synchronisers match gear speeds effectively, supporting smooth, positive shifts across a broad temperature range. The ester-based formula also provides excellent film strength, shear stability and protection under demanding conditions.

Key benefits:

• Fully synthetic GL-5 gear oil
• No added limited-slip friction modifier
• Designed to support effective synchroniser operation
• Contains extreme pressure additives like the 75W90 GL-5 oil, but lacks friction modifiers to balance slipperiness
• Strong protection for hypoid gears
• Excellent thermal and shear stability
• Suitable for selected manual transmissions and transaxles
• Helps with lock-up on weak limited-slip differentials
• Also used with clutch-type LSDs in racing for maximum lock up

Use only where an SAE 75W90 GL-5 lubricant is specified.

Clutch type limited-slip differentials may require a separate friction modifier. Compatible with Red Line Limited Slip Friction Modifier for tuning slippage

1 U.S. Quart - 946mL