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Redline MT-90 Manual Trans Fluid

Transmission & Drivetrain - Redline MT-90 Manual Trans Fluid
Transmission & Drivetrain - Redline MT-90 Manual Trans Fluid

This is a great upgrade for your manual trans! This is one of the easiest "mods" to do for your trans. Drain old fluid, pour this in. The trans will shift quicker, feel less notchy, less wear on its components, etc!

  • 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
  • MT-90 is 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
  • 75W90 GL-4 gear oil (similar to SAE 5W40/10W40 engine oil viscosity)
  • 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
  • Satisfies 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

    Most manual transmissions take a little over 2 quarts of fluid.

The price is per bottle.


F35 takes 1.8 bottles
F40 takes 2.8 bottles

Transmission & Drivetrain - Redline MT-90 Manual Trans Fluid
Transmission & Drivetrain - Redline MT-90 Manual Trans Fluid
Customer Reviews
4.9 Based on 22 Reviews
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Dave B.
United States United States

Redline MT 90

Great stuff. My Sky shifts so much smoother. Love it!

Ryan S.
United States United States


Good. Better then the factory fliud

Jordan D.
United States United States

This is the ****

I think it works very very nicely

Harold S.
United States United States

Good stuff

Improves shifting, will continue using.

Wyatt A.
United States United States

Great Stuff!

After swapping out the fluid, I took my car on a test drive and I definitely could tell the difference it made because my shifts were less notchy and smoother. Also shifts better when it's cold outside. Highly recommend.