U1P-Gear SAE 75W-90 Synthetic Gear Oil, API GL-4

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U1P-Gear SAE 75W-90 Synthetic Gear Oil, API GL-4 is formulated with synthetic base oils and specialty performance additives to provide improved high-temperature thermal and oxidative stability in a wide range of operating conditions. Specialty anti-scuffing additives and friction modifiers provide advanced protection and lubricity in extreme pressure conditions. Additionally, U1P-Gear SAE 75W-90 Synthetic Gear Oil, API GL-4 is highly shear stable while also resisting rust, oxidation, foaming, and varnish.

U1P-Gear SAE 75W-90 Synthetic Gear Oil, API GL-4 is designed for use in all seasons and exceeds the year-round, all-weather performance viscosity requirements of SAE J306 as well as the rigorous  performance requirements of API GL-4. API Category GL-4 designates the type of service characteristic of gears, particularly hypoids in automotive axles under high-speed and/or low-speed, high-torque conditions.

Ultra1Plus™ SAE 75W-90 API GL-4 Gear Plus Synthetic Oil highlights:

  • Strong and stable lubrication film for minimum wear.
  • Extended gear and bearing life due to minimal deposits.
  • Exceptional thermal stability and resistance to high-temperature oxidation.
  • Reduced maintenance costs by extending the life of seals and other components.
  • Increased load-carrying capability.
  • Adequate lubrication at extremely low and high temperatures.
  • Minimum leakage and reduced contamination.
  • With Limited Slip Differential additive package.

Ultra1Plus™ can export products worldwide. Products available for larger purchases, truckloads and pallets, please CONTACT US

Safety Data Sheets & Product Information:





warning.png WARNING: California Proposition 65 www.p65warnings.ca.gov

Typical Properties  
SAE J306 Viscosity Grade 75W-90
Appearance Yellow Transparent Liquid
Viscosity @ 40°C, cSt, ASTM D445 113.2
Viscosity @ 100°C, cSt, ASTM D445 15.5
Viscosity Index, ASTM D2270  145
Flash Point, °C, ASTM D92  205
Pour Point, °C, ASTM D97   -50
Exceeds Performance Requirements

 Packaging and shipping information:


How to read dimensions:

Quart | LxWxH: Length, Width & Height.

5 US Gallon Pail | HxD: Height & Diameter.


  • Avoid extremes of temperature.
  • Product in cardboard cartons must be stored under cover and away from damp conditions.
  • Drums (barrels) should be stored under cover if possible.
  • If drums must be stored outside then lay them on their side to prevent water collecting around the bungs.


  • 5
    As good as the spendy stuff.

    Posted by OrangeShoes on Oct 2nd 2021

    My transmission had 70K logged and I wanted to swap the fluid to keep it going. The warranty is that the fluid put in at the assembly plant will last its life. Well, duh! If a transmission dies because the old fluid is gunky and has lost its viscosity, then I guess that'd be the life of the transmission and they're covered. Synthetic transmission fluids that were up to spec for my car were all very expensive except for this, which didn't bust the bank. But, it's working beautifully despite the price. Shifts are as crisp as the day the car was new. We're in a Minnesota cold snap and the transmission isn't sluggish at all. It's good gunk.

  • 5
    MT oil

    Posted by Jason Thompson on Aug 26th 2021

    92 miata 5 speed shifts better than before

  • 5
    GL4 Nv4500

    Posted by Brenda Pothier on Aug 9th 2021

    This is what you need for a dodge diesel nv4500 5 speed transmission.

  • 5
    Good stuff!

    Posted by Gregory C Burrows on Aug 7th 2021

    Hard to find GL4 these days it seems... good price and high quality.

  • 5
    Great value works well

    Posted by mary green on Aug 3rd 2021

    We'll use it and all our cars have for a long time your price is very good better than Walmart

  • 5
    Great in my 2014 Mazda Miata

    Posted by D-Lowe on Jan 10th 2021

    This is my third swap of gear oil in my NC4 Miata since I bought it earlier this year. First was Redline MT90, then an 80W-90 viscosity that I should not have tried. This oil so far is much better - definitely worth a try in any Miata. If I still had my 90 NA, I definitely try it - I tried everything else in that one, including Motorcraft, and nothing worked well.

  • 5
    Only affordable GL-4 synthetic transmission gear oil

    Posted by S. C. on Dec 30th 2020

    I have a Mazda and a Toyota that use GL-4 gear oil in the gearbox. This used to be 5.99 a quart, but it has gone up quite a bit in price. It is still a bargain for synthetic GL-4 gear oil. GL-5 is not to be used in a gearbox with brass synchros, even if the GL-5 says it is compatible with GL-4.

  • 5
    Good deal

    Posted by DENNIS SKILES on Dec 10th 2020

    Price best out there. So far seems to work well in transfer case and transmission.

  • 5
    Just what a Toyota gearbox needs

    Posted by Brandon J. on Nov 22nd 2020

    I've worked in the automotive industry for nearly 20 years and I know the importance of using the specified fluids. For this application I couldn't find anything locally and most of the products I found online are for high performance use and are prohibitively expensive. This was just what was specified and the price is reasonable