Extreme PSI :: DIY and Fabrication :: Fluids :: Manual Transmission and Gear Fluids :: Redline Synthetic Manual Transmission Fluid : MT-90 75W90 GL-4

Redline Synthetic Manual Transmission Fluid : MT-90 75W90 GL-4 #17603

Redline Synthetic Manual Transmission Fluid : MT-90 75W90 GL-4 #17603

Redline Synthetic Manual Transmission Fluid : MT-90 75W90 GL-4
(1 reviews)  

MT-90 75W90 GL-4 Gear Oil

  • 75W90 GL-4 gear oil (similar to SAE 5W40/10W40 engine oil viscosity)
  • Popular in Nissan, Mazda, Mitsubishi, VW/Audi, Lotus Elise/Exige, Toyota
  • Offers quicker shifts, perfect synchronizer coefficient of friction
  • Safe for brass synchros, as it lacks the reactive sulfurs found in most GL-5 oils that cause damage
  • High performance gear protection and longer synchro life
  • Eliminates notchy shifting, even when cold
  • Satisifies the gear oil viscosity requirements of 75W, 80W and motor oil viscosities of SAE 40, 10W40, and 15W40
  • Recommended for GL-1, GL-3, and GL-4 applications, as well as where most special synchromesh fluids are specified


  • 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
  • MTL, MT-85 & MT-90 are not for use in differentials with hypoid gears
  • 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


API Service Class: GL-4
SAE Viscosity Grade (Motor Oil): 15W40
SAE Viscosity Grade (Gear Oil): 75W90
Vis @ 100°C, cSt: 15.6
Vis @ 40°C, cSt: 90
Viscosity Index: 185
Pour Point, °C: -45
Pour Point, °F: -49
Flash Point, °C: 240
Flash Point, °F: 465
Brookfield Viscosity @ -40°C, Poise: 320

Ships in 24 hours
SKU RDL-50304
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Customer feedback

Average customer rating:
(1 reviews)  

1 Most useful customer reviews (see all reviews):
martin morales (liquidnote@comcast.net)
redline is the best tranny fluid you can put in your 1g talon /eclipse or laser's. get it from extreme psi allways has it in stock and the staff is knowlegable on what tranny fluids best for your car. ask for HA hes hella cool :)
Was the above review useful to you? Yes (4) / No (1)