Red Line Gear Oil 75w140
Red Line 75W140 Gear Oil — SLG’s Race-Proven Choice
Red Line 75W140 is our go-to differential fluid for all Seems Legit Garage race cars. Whether you’re running a factory BMW limited-slip differential or a Ford 8.8 equipped with a Trac-Lok clutch-type LSD, this is the highest-quality gear oil you can put in your driveline.
This GL-5 gear oil comes pre-blended from high quality base stock and is made in the USA.
With Friction Modifier: Perfect for Clutch-Type LSDs
Use this standard differential fluid version in:
OEM BMW M clutch-pack differentials
Ford 8.8 Trac-Lok units
Any clutch-type LSD that requires smooth engagement
The friction modifier allows the differential’s internal clutches to slip and engage properly, preventing chatter and extending the time between rebuilds.
Without Friction Modifier: NS Version
Use Red Line 75W140NS (no friction modifier) if you’re running a Torsen-style differential, such as:
Wavetrac
Eaton Truetrac
Other gear-type/torsen units
The lack of friction modifier allows torsen units to function correctly without reducing their internal biasing capability. It can also increase lockup in clutch-type LSDs, but will accelerate clutch wear—so it’s only recommended when maximum lockup is the goal.
