---
product_id: 615253453
title: "Red Line (50304) MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant - 1 Quart (Pack of 3)"
brand: "red line"
price: "R3775"
currency: ZAR
in_stock: true
reviews_count: 13
category: "Red Line"
url: https://www.desertcart.co.za/products/615253453-red-line-50304-mt-90-75w-90-gl-4-manual
store_origin: ZA
region: South Africa
---

# High-temp resistance up to 300°F Safe for brass synchros, no reactive sulfurs 75W-90 viscosity for optimal gear protection Red Line (50304) MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant - 1 Quart (Pack of 3)

**Brand:** red line
**Price:** R3775
**Availability:** ✅ In Stock

## Summary

> ⚙️ Shift smoother, drive smarter — the ultimate manual transmission upgrade!

## Quick Answers

- **What is this?** Red Line (50304) MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant - 1 Quart (Pack of 3) by red line
- **How much does it cost?** R3775 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/615253453-red-line-50304-mt-90-75w-90-gl-4-manual)

## Best For

- red line enthusiasts

## Why This Product

- Trusted red line brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Gearbox Guardian:** Protects brass synchros by avoiding damaging reactive sulfurs found in GL-5 oils.
- • **Proven Track Record:** Trusted by enthusiasts and pros since 1979 for unmatched transmission longevity.
- • **Versatile Compatibility:** Perfect for GL-1, GL-3, and GL-4 applications, including special synchromesh fluids.
- • **Endurance Under Pressure:** Maintains performance on high-speed tracks, daily commutes, and rugged off-road use.
- • **Smooth Shifts, Every Time:** Eliminates notchy shifting even in cold starts for buttery gear changes.

## Overview

Red Line MT-90 75W-90 GL-4 Manual Transmission Lubricant is a premium gear oil designed for superior synchro protection and ultra-smooth shifting. With a high-temp rating of 300°F and compatibility across GL-1, GL-3, and GL-4 specs, it’s engineered to extend transmission life and eliminate grinding, even in cold conditions. Trusted by automotive enthusiasts for over four decades, this lubricant ensures reliable performance on everything from daily drives to high-performance track days.

## Description

Buy Red Line (50304) MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant - 1 Quart (Pack of 3): Gear Oils - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Feel good - I used this stuff to replace the old gear oil for my DC2 Integra ITR. No issues as if now. Shifts pretty good.
Review: The only manual transmission oil I will ever buy anymore - I have used this in three different vehicles over the years. First was a heavily modified and tuned 2008 Cobalt SS turbo with the F35 trans. I tracked that car often, including high speed courses, autocross, and the drag strip. The fluid held up fantastically, and always shifted smooth and accurately. I also used the SSlowbalt for my commute at the time, which was 120 miles a day @80-85mph. I have since (sadly) sold my SSlowbalt, and mostly drive my wife's previous (now mine) car, a moderately modified and tuned 2012 Cruze Eco with the M32 trans, that we bought brand new. I have used MT90 in that since the first trans fluid change at ~50k (150k miles at the time of writing this, was changed with the same fluid at 100k, and about to do a third change next week.) This stuff shifts SO SMOOTH! I wasn't having issues in my Cruze before I swapped the fluid, but I did, and still notice, how much nicer the shifting feels compared to my buddy's 2012 Cruze ECO 6MT. This is 100% worth it. I have driven our Cruze to both US coasts, through 39 states, ontario, and numerous drives back home to Detroit from Lincoln, NE. I also use my Cruze for the occasional autocross event. Just all around smooth and quiet operation. I also have this same fluid in my 1999 Jeep Wrangler TJ with 213k at the time of writing this. The MT90 smoothed it out to the point where I was worried, because I was so used to that old AX15 shifting like a dump truck, or something haha. But not anymore! Totally smooth, no grinding on faster shifts (1-2 used to grind a bit if I didn't remember I was driving a brick and tried to shift it too fast). Now it doesn't matter if I accidentally shift a bit too quickly, because there's absolutely no grind at all anymore! My TJ isn't a pavement princess. I use it for what it was made to do, and I use it a lot. That trans gets a regular workout. It has been about 15k miles since I swapped it. TL;DR: If you like your manual transmission to shift like butter, quiet, and precise, buy this fluid.

## Features

- The information below is per-pack only
- HIGH PERFORMANCE - gear protection and longer synchro life. Recommended for GL-1, GL-3, and GL-4 applications.
- QUICKER SHIFTS - perfect synchronizer coefficient of friction and eliminates notchy shifting, even when cold
- REQUIREMENTS - gear oil viscosity of 75W; 80W; SAE 40 10W40 and 15W40 motor oil
- POPULAR GEAR OIL FOR - GL-1, GL-3 and GL-4 applications, as well as where most special synchromesh fluids are specified. Safe for brass synchros, as it lacks the reactive sulfurs found in most GL-5 oils that cause damage
- WHY RED LINE - Established in 1979, Red Line Products perform & protect better than any on the market. No compromises

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CXPXWGY5 |
| Best Sellers Rank | #2,183 in Automotive ( See Top 100 in Automotive ) #6 in Gear Oils |
| Brand | Red Line |
| Brand Name | Red Line |
| Compatible Material | Brass |
| Container Type | Bottle |
| Customer Reviews | 4.9 out of 5 stars 5,073 Reviews |
| Item Form | Fluids,Oil |
| Item Type Name | ACCESSORIES |
| Item Weight | 5.1 pounds |
| Liquid Volume | 96 fluid ounces |
| Manufacturer | Yukon Gear & Axle |
| Material | Brass |
| Model Number | 50304 |
| Number of Items | 3 |
| Package Information | Bottle |
| Part Number | 50304 |
| Recommended Uses For Product | Lubricant,Lube |
| SAE J300 Viscosity Grade | 75W-90 |
| Unit Count | 96 Fluid Ounces |
| Upper Temperature Rating | 300 °F |
| Viscosity | 75W90 |

## Product Details

- **Brand:** Red Line
- **Item Weight:** 5.1 pounds
- **Liquid Volume:** 96 fluid ounces
- **Material:** Brass
- **Package Information:** Bottle

## Images

![Red Line (50304) MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant - 1 Quart (Pack of 3) - Image 1](https://m.media-amazon.com/images/I/51YUtPzMrkL.jpg)

## Available Options

This product comes in different **Size, Number Of Items** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Feel good
*by B***1 on June 28, 2026*

I used this stuff to replace the old gear oil for my DC2 Integra ITR. No issues as if now. Shifts pretty good.

### ⭐⭐⭐⭐⭐ The only manual transmission oil I will ever buy anymore
*by T***Y on July 10, 2021*

I have used this in three different vehicles over the years. First was a heavily modified and tuned 2008 Cobalt SS turbo with the F35 trans. I tracked that car often, including high speed courses, autocross, and the drag strip. The fluid held up fantastically, and always shifted smooth and accurately. I also used the SSlowbalt for my commute at the time, which was 120 miles a day @80-85mph. I have since (sadly) sold my SSlowbalt, and mostly drive my wife's previous (now mine) car, a moderately modified and tuned 2012 Cruze Eco with the M32 trans, that we bought brand new. I have used MT90 in that since the first trans fluid change at ~50k (150k miles at the time of writing this, was changed with the same fluid at 100k, and about to do a third change next week.) This stuff shifts SO SMOOTH! I wasn't having issues in my Cruze before I swapped the fluid, but I did, and still notice, how much nicer the shifting feels compared to my buddy's 2012 Cruze ECO 6MT. This is 100% worth it. I have driven our Cruze to both US coasts, through 39 states, ontario, and numerous drives back home to Detroit from Lincoln, NE. I also use my Cruze for the occasional autocross event. Just all around smooth and quiet operation. I also have this same fluid in my 1999 Jeep Wrangler TJ with 213k at the time of writing this. The MT90 smoothed it out to the point where I was worried, because I was so used to that old AX15 shifting like a dump truck, or something haha. But not anymore! Totally smooth, no grinding on faster shifts (1-2 used to grind a bit if I didn't remember I was driving a brick and tried to shift it too fast). Now it doesn't matter if I accidentally shift a bit too quickly, because there's absolutely no grind at all anymore! My TJ isn't a pavement princess. I use it for what it was made to do, and I use it a lot. That trans gets a regular workout. It has been about 15k miles since I swapped it. TL;DR: If you like your manual transmission to shift like butter, quiet, and precise, buy this fluid.

### ⭐⭐⭐⭐⭐ Scion grinding in 2nd or 3rd? This is what you need!
*by A***N on June 26, 2026*

Wow, I am shocked! So I've been dealing with my gears grinding in 2nd and 3rd for the past 1 1/2 Years in my manual 2005 Scion XA the car has had the problem since before i bought it, The previous owners replaced the clutch, And I'm assuming that someone had added extra gear oil, Because it spilled out when i took off the fill cap on ramps, I've been trying to figure out the grinding, For the past 2 years doing everything but trying to put a new clutch in, Previous owners also stated that the mechanic may have put the clutch in wrong, I guess he didn't, Because this nearly completely fixed the issue in under 200 miles of driving, Driving has also become much smoother, If you have a Scion XA i suggest changing to this oil regardless if your gears are grinding! You only need exactly 2 quarts for the Scion XA no more no less, I wish all m mechanics would look this up before adding too much oil! I found this out from reading forms on the Scion XA, Everyone suggested this oil for the grinding and regardless! So i hope someone sees it here!

## Frequently Bought Together

- Red Line (50304) MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant - 1 Quart (Pack of 3)
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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-08-17*