Manual Transmission & Transaxle Gear Lube GL-4 75W-90

MTG amsoil manual transmission fluid GL4

Manual Transmission & Transaxle Gear Lube 75W-90 Formulated specifically for demanding manual transmission and transaxle applications

SKU: MTG Category:

Synthetic Manual Transmission Fluid – GL4 75W-90

Outstanding extreme-pressure protection. Smooth shift quality. Better overall performance than conventional oils. Use in manual transmissions and transaxles that require 75W-85, 75W-90 or 80W-90 gear lube. See specifications below.

Now available in the EZ Pack (Squeeze Pack)!!

MTG amsoil manual transmission fluid GL4

Buy & Pricing

Towing, heavy hauling and performance driving create shock-loading conditions and elevated heat that threaten the performance and life of manual transmissions and transaxles. Making matters worse, horsepower, torque and towing capacities seem to increase with each new vehicle model year, increasing severity. AMSOIL Synthetic Manual Transmission & Transaxle Gear Lube is specifically formulated to reduce friction and maintain viscosity for long component and fluid life. It is designed to excel in severe-service conditions that exceed the limitations of conventional fluids.

Protects Against Wear & Heat in Severe Applications

Synthetic Manual Transmission & Transaxle Gear Lube is shear-stable and maintains its viscosity despite rigorous mechanical action. It provides a thick lubricating film and contains extreme-pressure additives to protect against wear in severe-service and shock-loading conditions common when towing or hauling. It resists thermal degradation and oxidation for excellent performance in high-temperature applications, such as the New Venture NV-4500 transmission, which retains heat due to its cast-iron housing and is often subject to increased torque from turbodiesel engines.

Quick Shifts & Excellent Protection in Hot Rods and Muscle Cars

Synthetic Manual Transmission Gear Lube’s friction-modified formula and excellent cold-flow properties promote smooth, fast engagement of synchronizers and gears. It protects against wear caused by the high-horsepower, large-displacement engines common to hot rods and muscle cars. It is formulated with seal conditioners to reduce leaks.

Promotes Longevity in Front-Wheel-Drive Transaxles

Synthetic Manual Transmission Gear Lube GL4 meets 75W/80W-90 viscosity requirements and exceeds API GL-4 performance requirements for many front-wheel-drive vehicles. Its excellent gear protection, extreme-temperature performance and durability promote maximum longevity and reduced maintenance costs.

  • Protects against increased heat and pressure
  • Outstanding cold-flow properties
  • Protects brass synchronizers
  • Friction-modified
  • Excellent seal compatibility
  • Inhibits rust and corrosion
  • Long service life

Gear Specs and Applications

Synthetic Manual Transmission & Transaxle Gear Lube is recommended for applications requiring a 75W-85, 75W-90 or 80W-90 viscosity gear oil with any of the listed specifications:

  • API GL-4
  • Chrysler MS-9070
  • ZF TE-ML 02B, 16A, 17A and 19A
  • MAN 341-Z2 (formerly MAN 341 ML)
  • MB 235.5
  • Replaces GM* part #12346190 and Chrysler part #4874459 for use in NV 4500 transmissions.

Examples of transmissions and transaxles requiring a 75W-90, API GL-4 lubricant include certain models of Hyundai, Infiniti, Kia, Lexus, Mazda, Mitsubishi, Nissan, Suzuki, Toyota, Volkswagen and Hino.

Examples of street rod and muscle car transmissions include Muncie, Borg Warner, Saginaw, Ford Toploader, Dearborn and New Process. Pretty much every transmission and transaxle of the past.

“State of the Art GL-4 Chemistry”

Replacing AMSOIL’s prior 80W-90 Synthetic Gear Lube (AGT), the AMSOIL MTG provides improved internal component protection. Many of these transmissions are cast iron and have exhaust pipes close to them, causing them to run hot. Increased operating temperatures can harden seals and cause oil leaks. In addition to lubricating gears, bearings and synchromesh systems, transmission oil must keep seals soft even when temperatures increase.

AMSOIL uses a unique seal additive though out the gear lube line others avoid because of costs. The premium synthetic formulation of AMSOIL Synthetic Manual Transmission and Transaxle Gear Lube is designed to specifically address the needs of these hot running transmissions.


AMSOIL Synthetic Manual Transmission and Transaxle Gear Lube (MTG) is a premium blend of the finest synthetic base oils and advanced, high-performance additives. It is formulated specifically for maximum protection in the most demanding manual transmission and transaxle applications where an extreme pressure GL-4 gear lube is specified, including those where high horsepower/high torque engines and towing or heavy loads increase transmission stress.

AMSOIL MTG helps prevent the thinning effects of mechanical shear. It is formulated to maintain its viscosity and superior film strength for consistent, long-lasting wear protection. AMSOIL Synthetic Manual Transmission & Transaxle Gear Lube excels in hot and cold temperature extremes that exceed the limits of conventional mineral oils. It protects against rust, keeps seals soft for long life, and is compatible with brass synchros for smooth synchromesh shift quality.

Note: GL-4 is a separate gear oil classification. GL-5 is not a upgrade or replacement so if your requirement is GL-4 you NEED to use a GL-4!

Ideal for NV-4500 Transmissions

AMSOIL Synthetic Manual Transmission & Transaxle Gear Lube is a thermally stable, extreme pressure formulation that resists heat, oxidation, acid build-up and varnish. It is the ideal gear lube for high temperature applications, including the New Venture NV-4500 transmission, which retains heat due to its cast iron housing and is often subjected to heavy loads and high torque from turbo-diesel engines.

Service Life

Under normal operating conditions AMSOIL Synthetic Manual Transmission & Transaxle Gear Lube last two times longer than conventional petroleum GL-4 gear oils. Where the original equipment manufacturer (OEM) recommends synthetic oils, follow the OEM drain interval (such as NV-4500).

Buy & Pricing

This product is not expected to cause health concerns when used for the intended application and according to the recommendations in the Material Safety Data Sheet (MSDS). An MSDS is available via the Internet at or upon request at (715) 392-7101. Keep Out of Reach of Children. Don’t pollute.

For warranty information, visit

AMSOIL MTG GL4 Transmission Fluid Reviews

Product review

By  MELVIN,  a  Verified Buyer  from  Federal Way, Washington   on  August 14, 2023
The packaging made it easy to install in transmission with very minimal mess. I was impressed with how well the transmission shifted In just a few miles of driving. The more I drove it the better it shifted. Very happy with the results and highly recommend this product.

Great fluid for NV4500

By  WILL,  a  Verified Buyer  from  Salt Lake City  on  March 07, 2023
Made the switch from another brand and its night and day difference in my NV4500. Feels and shifts smoother. Other brand made shifting notchy and Amsoil is smooth as glass.

Great product

By  SHANE,  a  Verified Buyer  from  Ohio   on  February 24, 2023
Great product , the easy squeeze container is genius. Well designed, well made and most of all easy to use . Cut my labor costs down and time saved.

Manual Transmission & Transaxle Gear Lube 75W-90

By  MONTE,  a  Verified Buyer  from  USA  on  February 07, 2022
Hey, love these new Easy Packs. Way less spillage and easier to store. 100 percent synthetic GL-4 Gear oil. Perfect for your manual transmission application. Low sulfur content to ensure long life for those synchros.

Great for the NV4500!

By  COREY,  a  Verified Buyer  from  Colorado  on  January 06, 2022
I recently just changed the fluid in my 1999 Dodge Ram 2500 diesel with the NV4500 and have noticed that it does shift a little better since. I drive my truck daily either on the normal roads as well as on the ranch. Being that the fluid for our transmissions are very few and far between, this fluid is cheaper and seems to be doing very well so far. Would definitely recommend this fluid to anybody with the NV4500. Thanks again Amsoil for great products!

Fixes hard shifting

By  Los,  a  Verified Buyer  from  CA  on  January 03, 2022
My 2010 VW Golf 2.5L Manual Trans was hard shifting. The problem was worse in warmer weather than cold weather. At first, I thought it was a hardware issue. I proceeded to change all the worn-out plastic and rubber bushings on my shifter, shifter bracket, etc… Then I finally changed my manual transmission fluid. It was missing nearly half a liter of Trans fluid! I’m guessing that my petroleum-based Trans fluid had burned off. Big lesson. Check your manual Trans fluid first and go synthetic. It changed the fluid 4 times until the shifter felt better. From now on I’m changing my Trans fluid every 5-10K miles with synthetic.


By  JOEL,  a  Verified Buyer  from  Northern Minnesota   on  November 15, 2021
Cold weather needs oil that flows. Amzoil works for manual transmission.

Shifts like butter

By  Ninja,  a  Verified Buyer  from  Orange, CA  on  October 19, 2021

Used other brand synthetic MTL shifting was so so. When I switched over to Amsoil MTL. Shifting on my 6spd Nb2 Miata is buttery smooth. Highly recommended for manual trans

Great product!!

By  GARY,  a  Verified Buyer  on  April 07, 2021
I used the manual transmission fluid in my 2010 Audi A4 6 speed, and it works great. Transmission shifts so much smoother. Highly recommended!

A few years have passed since the debut of the AMSOIL Manual Transmission GL-4. It has really become a top seller. First, there aren’t too many quality GL-4 75W90 (or 80W90) on the market. The synthetic products offered by our competitors eventually cause shift/downshift issues as they age. I’m writing this due to several testimonial calls. One recently was from a fellow Studebaker Hawk owner who called to tell me there was a write-up in the last issue of the Studebaker Club Magazine, the “Turning Wheels”. It praised AMSOIL over other brands such as Redline for solving hard shifting issues which occurred after the fluid had 3000 miles on it. The downshifting of the AMSOIL never failed after additional miles. Protect your synchronizers!

Use a product approved for specific GM and Chrysler use w/o paying the OEM price! Use AMSOIL MTG!

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