---
product_id: 715725616
title: "Red Line 50304 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Quart (4 Pack)"
brand: "red line"
price: "A$358"
currency: AUD
in_stock: false
reviews_count: 5
category: "Red Line"
url: https://www.desertcart.com.au/products/715725616-red-line-50304-mt-90-75w-90-gl-4-manual
store_origin: AU
region: Australia
---

# Faster, smoother shifting even when cold 75W-90 viscosity for optimal gear protection GL-4 safe, non-corrosive to brass synchros Red Line 50304 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Quart (4 Pack)

**Brand:** red line
**Price:** A$358
**Availability:** ❌ Out of Stock

## Summary

> ⚙️ Shift smoother, protect harder — never settle for less.

## Quick Answers

- **What is this?** Red Line 50304 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Quart (4 Pack) by red line
- **How much does it cost?** A$358 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/715725616-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

- • **Trusted Legacy:** Red Line’s proven expertise since 1979 ensures uncompromising transmission care.
- • **Cold-Start Ready:** Smooth, quick shifts from the first turn, even in low temperatures.
- • **Effortless Shifting:** Perfect synchronizer friction coefficient eliminates notchy shifts and gear grind.
- • **Synchro-Safe Formula:** GL-4 rated and free from reactive sulfurs that damage brass synchronizers.
- • **Precision Gear Protection:** High-performance formula extends synchro and gear life under all conditions.

## Overview

Red Line 50304 MT-90 is a premium 75W-90 GL-4 manual transmission lubricant designed for superior gear and synchronizer protection. Its unique formula ensures effortless, notchy-free shifting even in cold conditions, while being safe for brass synchros. Trusted by professionals since 1979, this lubricant enhances transmission longevity and performance for manual transmissions and transaxles requiring GL-1, GL-3, or GL-4 oils.

## Description

Red Line MT-90 Manual Transmission Lubricant A 75W90 GL-4 gear oil (SAE 10W/15W/40 engine oil viscosity) designed for use in manual transmissions and trans-axles. Red Line MT-90 Manual Transmission Lubricant provides excellent protection of gears and synchronizers and its balanced slipperiness provides a perfect coefficient of friction, allowing easier shifting. Red Line MTL / MT-90 BENEFIT SUMMARY * Eliminates notchy shifting * Designed for manual transmissions and trans-axles * Perfect synchronizer coefficient of friction * Enables high-speed downshifting * Excellent shifting even when cold * Eliminates gear whine and rattle at high temperatures * High-performance gear protection * Non-corrosive toward synchronizers * Satisfies manual transmissions and trans-axles requiring motor oils or GL-1, GL-3, or GL-4 gear oils.

Review: well, not much to say as i feel it smoother on shifting. only downside is the bottle opening. can't really find a right pump for it. i end up just cutting it down to the first top and was able to use a pump that i had. it didn't screw on so i just had to be extra careful not to tip it over. used it in a 2007 carolla s manual transmission that had about 132k miles on it. looks like previous owner never changed it.
Review: Changed out the gl-5 transmission oil that was in my 2006 tacoma to this oil. With the old oil the truck shifted rough and slow, would grind into 3rd gear every shift, felt like a worn synchro. With this new oil the shifts are smooth and it just pops right into the gear. 3rd Gear goes in perfectly 95% of the time, sometimes get some feedback of the synchro when I put it in but its minor compared to before. Would Recommend it for any vehichle especially with brass synchros, but if your owners manual says gl-5 only stick to that. Great oil just pricey might be possible to find it locally for cheaper.

## Features

- 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 | B000QFN326 |
| Best Sellers Rank | #15,991 in Automotive ( See Top 100 in Automotive ) #18 in Automotive Transmission Fluids |
| Brand | Red Line |
| Customer Reviews | 4.8 4.8 out of 5 stars (2,799) |
| Date First Available | 1 May 2024 |
| Item Weight | 907 g |
| Item model number | 50304 |
| Manufacturer | RED LINE |
| Manufacturer Part Number | 50304 |
| Model | (1063017) MT-90 75W90 GL-4 - QUART |
| Product Dimensions | 10.16 x 10.16 x 22.86 cm; 907.18 g |
| Viscosity | 75W-90 |

## Product Details

- **Brand:** Red Line
- **Item weight:** 2 Pounds
- **Liquid volume:** 128 Fluid Ounces
- **Material:** Oil
- **Package information:** Bottle

## Images

![Red Line 50304 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Quart (4 Pack) - Image 1](https://m.media-amazon.com/images/I/51zz0TuOOUL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by L***N on 20 February 2019*

well, not much to say as i feel it smoother on shifting. only downside is the bottle opening. can't really find a right pump for it. i end up just cutting it down to the first top and was able to use a pump that i had. it didn't screw on so i just had to be extra careful not to tip it over. used it in a 2007 carolla s manual transmission that had about 132k miles on it. looks like previous owner never changed it.

### ⭐⭐⭐⭐⭐ Review
*by M***L on 10 August 2017*

Changed out the gl-5 transmission oil that was in my 2006 tacoma to this oil. With the old oil the truck shifted rough and slow, would grind into 3rd gear every shift, felt like a worn synchro. With this new oil the shifts are smooth and it just pops right into the gear. 3rd Gear goes in perfectly 95% of the time, sometimes get some feedback of the synchro when I put it in but its minor compared to before. Would Recommend it for any vehichle especially with brass synchros, but if your owners manual says gl-5 only stick to that. Great oil just pricey might be possible to find it locally for cheaper.

### ⭐⭐⭐⭐⭐ Review
*by M***S on 9 August 2025*

Viskas gerai.

## Frequently Bought Together

- Red Line 50304 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Quart (4 Pack)
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*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-01-24*