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Red Line MT-90 75W90 GL-4 - 1 quart

Gear Oil

2895237 - 50304
  • 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
  • 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
  • Not Available
    Availability: CAN ONLY SHIP UPS GROUND
    Pricing: $23.10
    5 5 1


  • 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
  • Details

    • 2895237 - 50304
    • 2895237
    • 50304
    • Red Line Synthetic Oil
    • New

    Shipping Information

    • Item Requires Shipping
    • 2.0 lbs.
    • W9.0000” x H7.0000” x L4.0000”

    Customer Reviews

    Comment Total Reviews (1)

    Quicker and smoother shifts
    • Currently 5/5 Stars

    Reviewed by:

    Product ownership: Less than 1 month

    Purchased from: 5X Racing

    After changing out the trans fluid in my '91, it shifts way better and with a lot more precision. After replacing the 4 components (2 boots, 2 bushings) and changing the trans fluid (which was GRAY!) the shifter feels so much better thru the gears. Great stuff and it wasn't too hard to switch the old out with the new. If you don't have this in your Miata, get some and you'll feel the difference for yourself!

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