---
product_id: 715725616
title: "50304 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Quart (4 Pack)"
brand: "red line"
price: "₩546129"
currency: KRW
in_stock: true
reviews_count: 5
category: "Red Line"
url: https://www.desertcart.kr/products/715725616-50304-mt-90-75w-90-gl-4-manual-transmission-transaxle
store_origin: KR
region: South Korea
---

# Perfect friction coefficient for smoother, quicker shifts 75W-90 viscosity for optimal gear protection GL-4 rated, safe for brass synchros, extends transmission life 50304 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Quart (4 Pack)

**Brand:** red line
**Price:** ₩546129
**Availability:** ✅ In Stock

## Summary

> ⚙️ Shift Like a Pro, Protect Like a Boss

## Quick Answers

- **What is this?** 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?** ₩546129 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/715725616-50304-mt-90-75w-90-gl-4-manual-transmission-transaxle)

## 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

- • **Ultimate Gear Defense:** High-performance formula protects gears and synchronizers under extreme conditions
- • **Versatile Compatibility:** Meets GL-1, GL-3, GL-4 specs and matches motor oil viscosities 10W-40 & 15W-40 for broad application
- • **Synchro-Friendly Formula:** GL-4 rating ensures zero corrosive damage to brass synchros, prolonging transmission health
- • **Trusted Legacy Performance:** Red Line’s proven formula since 1979 delivers uncompromising reliability and smooth driving
- • **Effortless Shifting Mastery:** Eliminates notchy shifts even in cold starts for seamless gear changes

## Overview

Red Line 50304 MT-90 is a premium 75W-90 GL-4 manual transmission lubricant designed to deliver smoother, quicker shifts and superior gear protection. Its unique friction coefficient eliminates notchy shifting and gear noise, even in cold conditions, while being safe for brass synchros. Compatible with a wide range of manual transmissions and transaxles, this high-performance gear oil extends transmission life and enhances driving precision.

## 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: 私の車は2.6L入るので３本で使い切りれました。

## 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 | #14,374 in Automotive ( See Top 100 in Automotive ) #21 in Automotive Transmission Fluids |
| Brand | Red Line |
| Customer Reviews | 4.8 4.8 out of 5 stars (2,805) |
| 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

![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)

## Available Options

This product comes in different **Size** options.

## 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 A***ー on 1 June 2024*

私の車は2.6L入るので３本で使い切りれました。

### ⭐⭐⭐⭐⭐ 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.

## Frequently Bought Together

- Red Line 50304 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Quart (4 Pack)
- Slippery Pete - Fluid Pump for Standard Quart Bottles - 8cc per Pump Stroke and 3rd Hand Adapter, Transfer Gear Oil, Transmission and Differential Fluid (28mm)
- Red Line 57904 75W90 GL-5 Synthetic Gear Oil for Hypoid Limited Slip Differentials - 1 Quart (2 Pack)

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*Product available on Desertcart South Korea*
*Store origin: KR*
*Last updated: 2026-03-07*