---
product_id: 7601045
title: "50304 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Quart (4 Pack)"
brand: "red line oil"
price: "NT$7742"
currency: TWD
in_stock: true
reviews_count: 13
category: "Red Line"
url: https://www.desertcart.tw/products/7601045-50304-mt-90-75w-90-gl-4-manual-transmission-transaxle
store_origin: TW
region: Taiwan
---

# Synthetic formula withstands high heat & load 75W-90 viscosity for optimal gear protection GL-4 rating safe for brass synchros, no corrosive additives 50304 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Quart (4 Pack)

**Brand:** red line oil
**Price:** NT$7742
**Availability:** ✅ In Stock

## Summary

> ⚙️ Shift Smooth, Drive Confident: The Ultimate Gear Oil Upgrade

## 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 oil
- **How much does it cost?** NT$7742 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/products/7601045-50304-mt-90-75w-90-gl-4-manual-transmission-transaxle)

## Best For

- red line oil enthusiasts

## Why This Product

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

## Key Features

- • **Effortless Cold Shifts:** Experience buttery smooth gear changes even in sub-40°F mornings—no more notchy resistance.
- • **Heat & Load Resilience:** Synthetic 75W-90 oil that maintains viscosity and protection under extreme driving conditions.
- • **Synchro Longevity Boost:** Protect your transmission’s brass synchros with a formula designed to extend their life and performance.
- • **Trusted Legacy Performance:** Since 1979, Red Line’s uncompromising quality keeps your manual transmission running like new.
- • **Perfect Fit for Imports & Domestics:** Ideal for Nissan, Toyota, Mazda, and more—engineered to meet GL-1, GL-3, and GL-4 specs flawlessly.

## Overview

Red Line 50304 MT-90 is a premium synthetic 75W-90 GL-4 manual transmission and transaxle lubricant designed to deliver smoother shifts, protect brass synchros, and extend transmission life. Its advanced formula eliminates notchy shifting even in cold weather, withstands high heat and load, and is trusted by enthusiasts and professionals since 1979. Perfect for a wide range of vehicles requiring GL-1 to GL-4 gear oils, this 4-pack quart set ensures your manual gearbox performs at its peak with every drive.

## Description

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

Review: Smooth Shifting and Quiet Operation—Worth the Upgrade - Red Line MT-90 is a top-tier synthetic gear oil that delivers noticeable improvements in manual transmission performance. I used it in a high-mileage 5-speed and immediately felt smoother shifts—especially in cold weather. It quieted down some minor gear whine and made engagement feel more precise. The GL-4 rating is perfect for transmissions that need protection without the aggressive additives found in GL-5 oils, which can be harsh on yellow metals like synchros. The viscosity is ideal for most import and domestic gearboxes that spec 75W-90, and it holds up well under heat and load. If you're chasing better shift feel or just want to treat your transmission right, MT-90 is a solid investment. It’s not the cheapest option, but the performance and protection are worth every drop.
Review: Excellent synthetic manual transmission gear oil - Excellent manual transmission gear oil We notice easier the Toyota Tacoma is much easier to shift gears in cold weather. Previous brand oil required much slower shifting with considerable resistance on cold morning below 40 degrees. GL4 is much safer to use in transmission with brass parts than GL5 because GL5 additives are often chemically reactive with brass causing unnecessary wear.

## 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 | B003P550IE |
| Best Sellers Rank | #12,512 in Automotive ( See Top 100 in Automotive ) #28 in Gear Oils |
| Brand | Red Line Oil |
| Date First Available | June 2, 2010 |
| Is Discontinued By Manufacturer | No |
| Item Form | Fluids,Oil |
| Item Weight | 1.98 pounds |
| Item model number | 50304 |
| Liquid Volume | 128 Fluid Ounces |
| Manufacturer | Red Line |
| Material | Synthetic |
| Number of Items | 4 |
| Package Information | Bottle |
| Product Dimensions | 16 x 4 x 9 inches |
| Recommended Uses For Product | Gear Oil |
| SAE J300 Viscosity Grade | 75W-90 |
| Specific Uses For Product | Manual transmissions and transaxles, particularly in vehicles from Nissan, Toyota, and Mazda, and in conditions that require gear protection, smooth shifting, and longer synchro life. |
| UPC | 737534816608 |
| Unit Count | 128.0 Fluid Ounces |
| Viscosity | 75W90 |

## Product Details

- **Brand:** Red Line Oil
- **Liquid Volume:** 128 Fluid Ounces
- **Material:** Synthetic
- **Package Information:** Bottle
- **Recommended Uses For Product:** Gear Oil

## 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/71LJIn7PldL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Smooth Shifting and Quiet Operation—Worth the Upgrade
*by F***E on October 14, 2025*

Red Line MT-90 is a top-tier synthetic gear oil that delivers noticeable improvements in manual transmission performance. I used it in a high-mileage 5-speed and immediately felt smoother shifts—especially in cold weather. It quieted down some minor gear whine and made engagement feel more precise. The GL-4 rating is perfect for transmissions that need protection without the aggressive additives found in GL-5 oils, which can be harsh on yellow metals like synchros. The viscosity is ideal for most import and domestic gearboxes that spec 75W-90, and it holds up well under heat and load. If you're chasing better shift feel or just want to treat your transmission right, MT-90 is a solid investment. It’s not the cheapest option, but the performance and protection are worth every drop.

### ⭐⭐⭐⭐⭐ Excellent synthetic manual transmission gear oil
*by R***C on January 22, 2026*

Excellent manual transmission gear oil We notice easier the Toyota Tacoma is much easier to shift gears in cold weather. Previous brand oil required much slower shifting with considerable resistance on cold morning below 40 degrees. GL4 is much safer to use in transmission with brass parts than GL5 because GL5 additives are often chemically reactive with brass causing unnecessary wear.

### ⭐⭐⭐⭐⭐ good!
*by J***K on December 27, 2025*

damn good stuff!!!! but a little pricey.

## 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 (4 Pack)

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*Product available on Desertcart Taiwan*
*Store origin: TW*
*Last updated: 2026-03-23*