---
product_id: 7601143
title: "Red Line 50304 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL)- 1 Quart (12 Pack)"
brand: "red line"
price: "€ 498.00"
currency: EUR
in_stock: true
reviews_count: 10
category: "Red Line"
url: https://www.desertcart.it/products/7601143-red-line-50304-mt-90-75w-90-gl-4-manual
store_origin: IT
region: Italy
---

# Reduces shift time with perfect synchronizer friction 75W-90 viscosity for optimal gear protection GL-4 safe, protects brass synchros from damage Red Line 50304 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL)- 1 Quart (12 Pack)

**Brand:** red line
**Price:** € 498.00
**Availability:** ✅ In Stock

## Summary

> ⚙️ Shift smoother, drive smarter — don’t 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 (12 Pack) by red line
- **How much does it cost?** € 498.00 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.it](https://www.desertcart.it/products/7601143-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 means no compromises on quality
- • **Rare GL-4 Formula:** Hard-to-find gear oil that’s safe for brass synchros and special synchromesh needs
- • **Precision Viscosity:** 75W-90 grade ensures consistent protection across temperature ranges
- • **Longer Transmission Life:** High-performance formula extends synchro and gear durability
- • **Smooth Shifts, Every Time:** Eliminates notchy, crunchy gear changes—even in cold starts

## Overview

Red Line 50304 MT-90 is a premium 75W-90 GL-4 manual transmission and transaxle lubricant designed to deliver smoother, faster shifts and superior gear protection. Its unique formula protects brass synchronizers by avoiding harmful sulfurs found in GL-5 oils, making it ideal for manual transmissions requiring GL-1, GL-3, or GL-4 specs. Trusted since 1979, this lubricant enhances synchro life and performance across a wide temperature range, ensuring your vehicle shifts like new even in cold conditions.

## Description

Buy Red Line 50304 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL)- 1 Quart (12 Pack): Gear Oils - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Worth the price. - Get what you pay for, though pricey, irrefutable 'performance' gains: vehicle shifts much much much more smoothly now - no more 'crunchy' shifts, & all gears operate better in a wider range of temps as well. Prior to the fluid change, 1st & Reverse were the more difficult gears to get in to, especially in colder weather - before the fluid had a chance to warm up - now they all shift smooth as butter. I can also shift much faster as a result. Last little + is that the fluid doesn't smell horrid.
Review: Miracle Juice! - I put this in a 2002 Chevy Tracker (rebadged Suzuki Vitara) with a 5 speed stick transmission and lever operated transfer case. The factory specification calls for a 75w90 GL4 gear lube in both but a previous owner had put GL5 rear end gear lube in them. GL5 eats at the "yellow metal" brass/bronze used in the gear synchronizers in the transmission and transfer case. As a result of this the transfer case would not shift into low range and the 5 speed stick was very tricky to shift. Hard shifts, having to force it into gear, being stiffer when it was cold, just overall not smooth. I was worried because a friend with a Jeep had a similar occurrence and ended up replacing his whole transmission because it became unshiftable and wouldn't hold gears. Read a review of this Redline and it's specific use for manual transmissions. Figured it couldn't hurt and put it in the transmission and transfer case. IMMEDIATELY it was smoother to shift just sitting in the garage with the engine off. I backed out of the garage and was able to promptly push it into 4lo for the first time since I have owned it. Worked great and I backed right up a small hill without any trouble. Several weeks later it's shifting better and low range is back. I will say the transmission was obviously damaged and the transfer case is still not smooth going into low range but I CAN go into low range now and the transmission is definitely smoother. I can only imagine what this stuff would be like in a transmission in better shape than mine. It's not cheap but considering how hard it is to find GL4 rated 75w90 anymore (I bet your local parts store doesn't have it or has a few quarts at most) I'd highly recommend this Redline product.

## 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 | B005JVFC5S |
| Best Sellers Rank | #2,193 in Automotive ( See Top 100 in Automotive ) #6 in Gear Oils |
| Brand Name | Red Line |
| Container Type | Bottle |
| Customer Reviews | 4.9 4.9 out of 5 stars (4,948) |
| Global Trade Identification Number | 00083522503242 |
| Item Form | Oil |
| Liquid Volume | 384 Fluid Ounces |
| Manufacturer | Red Line |
| Material | Oil |
| Recommended Uses For Product | Lube |
| Specific Uses For Product | Lubricating manual transmissions and transaxles, protecting gears and synchronizers, ensuring proper shifting in various vehicles and operating conditions |
| UPC | 083522503242 |
| Unit Count | 384 Fluid Ounces |
| Viscosity | 75W-90 |

## Product Details

- **Brand:** Red Line
- **Liquid Volume:** 384 Fluid Ounces
- **Material:** Oil
- **Package Information:** Bottle
- **Recommended Uses For Product:** Lube

## Images

![Red Line 50304 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL)- 1 Quart (12 Pack) - Image 1](https://m.media-amazon.com/images/I/71eM4SSV-vL.jpg)
![Red Line 50304 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL)- 1 Quart (12 Pack) - Image 2](https://m.media-amazon.com/images/I/81zyln3z-IL.jpg)
![Red Line 50304 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL)- 1 Quart (12 Pack) - Image 3](https://m.media-amazon.com/images/I/81eZ7tyT1BL.jpg)
![Red Line 50304 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL)- 1 Quart (12 Pack) - Image 4](https://m.media-amazon.com/images/I/81hzhcHUXLL.jpg)
![Red Line 50304 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL)- 1 Quart (12 Pack) - Image 5](https://m.media-amazon.com/images/I/81M9Tv+BFuL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Worth the price.
*by Z***. on February 5, 2026*

Get what you pay for, though pricey, irrefutable 'performance' gains: vehicle shifts much much much more smoothly now - no more 'crunchy' shifts, & all gears operate better in a wider range of temps as well. Prior to the fluid change, 1st & Reverse were the more difficult gears to get in to, especially in colder weather - before the fluid had a chance to warm up - now they all shift smooth as butter. I can also shift much faster as a result. Last little + is that the fluid doesn't smell horrid.

### ⭐⭐⭐⭐⭐ Miracle Juice!
*by A***M on February 8, 2012*

I put this in a 2002 Chevy Tracker (rebadged Suzuki Vitara) with a 5 speed stick transmission and lever operated transfer case. The factory specification calls for a 75w90 GL4 gear lube in both but a previous owner had put GL5 rear end gear lube in them. GL5 eats at the "yellow metal" brass/bronze used in the gear synchronizers in the transmission and transfer case. As a result of this the transfer case would not shift into low range and the 5 speed stick was very tricky to shift. Hard shifts, having to force it into gear, being stiffer when it was cold, just overall not smooth. I was worried because a friend with a Jeep had a similar occurrence and ended up replacing his whole transmission because it became unshiftable and wouldn't hold gears. Read a review of this Redline and it's specific use for manual transmissions. Figured it couldn't hurt and put it in the transmission and transfer case. IMMEDIATELY it was smoother to shift just sitting in the garage with the engine off. I backed out of the garage and was able to promptly push it into 4lo for the first time since I have owned it. Worked great and I backed right up a small hill without any trouble. Several weeks later it's shifting better and low range is back. I will say the transmission was obviously damaged and the transfer case is still not smooth going into low range but I CAN go into low range now and the transmission is definitely smoother. I can only imagine what this stuff would be like in a transmission in better shape than mine. It's not cheap but considering how hard it is to find GL4 rated 75w90 anymore (I bet your local parts store doesn't have it or has a few quarts at most) I'd highly recommend this Redline product.

### ⭐⭐⭐⭐⭐ Nice product
*by R***S on March 9, 2026*

Not much to say it is what it is cheaper than local auto parts store got here quickly

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*Product available on Desertcart Italy*
*Store origin: IT*
*Last updated: 2026-05-11*