Red Line 75W140NS GL-5 Synthetic Gear Oil

(Exc. 8% Sales Tax - GA only)
No stock, delayed dispatch
Part Number
Red Line Oils

Red Line 75W140NS GL-5 synthetic gear oil, recommended for use in manual transmissions, transaxles and differentials. Designed to provide excellent gear protection at higher temperatures and has shown temperature reductions of 10-70°F, making it especially suited to those used in motorsport events.

This oil doesn't have the friction modifiers that quieten mechanical plate type differentials, so it's not suited for use in road vehicles or those without a limited slip differential. Offers excellent gear and synchro protection with balanced slipperiness for easier shifting in cold climates.

Red Line limited slip friction additives available separately to fine tune of you diff's lock up point. Popular for historic and vintage transmissions, like Mid-1930s to early-1950s synchro equipped gearboxes in cars and trucks and helps with noisy or rough shifting in troubled A-833 Dodge/Plymouth 4-speed transmissions from 1964 to 1969.

It's also an option for noisy transmissions when mixed with 75W90NS or MT-90 to bring viscosity level up, as well as in clutch-type limited slip differentials in racing for maximum lock-up, with some users adding Limited Slip Friction Modifier in small doses to customize slippage.

Supplied in 1 quart (0.946ml) bottles

Anon-corrosive formula, safe for use with all synchro materials, Red Line 75W140NS exceeds the requirements of API GL-5 gear oil.


  • Reduces friction and runs cooler
  • Provides maximum locking for race LSD's
  • Tuneable with Red Line friction modifier
  • For transaxles needing hypoid protection
  • Also historic and vintage transmissions
  • P65 Warning
     "WARNING: This product contains a chemical known to the State of California to cause cancer and/or birth defects or other reproductive harm.