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Red Line Oil

RED 50304

Redline MT90 75W90 GL-4 Synthetic Gear Oil (50304)

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MT90 75W90 GL-4 Full Synthetic Gear Oil by Red Line

Since most GL-5 gear oils for differentials are too slippery for manual transmissions, Red Line offers these products that ensure proper shifting while providing ultimate wear protection. Popular in Nissan, Mazda, Mitsubishi, VW/Audi, Lotus Elise/Exige, Toyota, Mendeola transmissions and Atlas transfer cases for Off Road.


  • Appropriate coefficient of friction for most manual transmission synchronizers (other's synthetic gear oils are often too slippery for proper synchro engagement)
  • Red Line offers lubricants to pinpoint nearly every transmission application
  • Excellent gear and synchro protection, balanced slipperiness for easier shifting in cold climates
  • Excellent for high- and low-mile transmissions
  • Compatible with petroleums and other synthetics

MTL, MT-85 & MT-90 are not for use in differentials with hypoid gears. Recommended for GL-1, GL-3 and GL-4 applications, as well as where most special synchromesh fluids are specified. Satisfies the gear oil viscosity requirements of 75W90, 80W90, 90 and motor oil viscosities of SAE 40, 10W40 and 15W40


  • Universal


  • API Service Class: GL-4
  • SAE Viscosity Grade: 75W90
  • Vis @ 100°C: 15.6
  • Vis @ 40°C: 86.2
  • Viscosity Index: 194
  • Pour Point, °C: -45
  • Pour Point, °F: -49
  • Brookfield Viscosity @ -40°C, Poise: 320

What's In The Box?

  • 1 Quart/Gallon - Red Line MT90 75W90 GL4 Gear Oil



  • Manufacturer Standard Warranty