---
product_id: 180466380
title: "Oil (50304) MT-90 75W-90 GL-4 Manual Transmission and Trans axle Lubricant - 1 Quart"
brand: "red line"
price: "€ 154.01"
currency: EUR
in_stock: true
url: https://www.desertcart.fi/products/180466380-oil-50304-mt-90-75w-90-gl-4-manual-transmission
store_origin: FI
region: Finland
---

# 75W-90 Viscosity - optimal gear protection GL-4 Formula - safe for brass synchros Made in USA - premium quality assurance Oil (50304) MT-90 75W-90 GL-4 Manual Transmission and Trans axle Lubricant - 1 Quart

**Brand:** red line
**Price:** € 154.01
**Availability:** ✅ In Stock

## Summary

> 🛠️ Shift Smooth, Drive Confident – The Ultimate Gear Oil Upgrade

## Quick Answers

- **What is this?** Oil (50304) MT-90 75W-90 GL-4 Manual Transmission and Trans axle Lubricant - 1 Quart by red line
- **How much does it cost?** € 154.01 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/180466380-oil-50304-mt-90-75w-90-gl-4-manual-transmission)

## 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

- • **All-in-One Lubricant:** Perfectly engineered for both manual transmissions and transaxles, reducing the need for multiple products.
- • **FOMO-Proof Your Ride:** Join the elite drivers who trust Red Line Oil to keep their gearboxes whisper-quiet and long-lasting.
- • **Synchro-Safe Formula:** GL-4 rating means no reactive sulfides, protecting your brass synchros from corrosion and wear.
- • **Precision Gear Protection:** Advanced 75W-90 viscosity ensures smooth, reliable manual transmission performance under all conditions.
- • **Trusted American Craftsmanship:** Proudly made in the USA, guaranteeing top-tier quality and consistency for your vehicle.

## Overview

Red Line Oil MT-90 75W-90 GL-4 is a premium manual transmission and transaxle lubricant designed to protect brass synchros by eliminating reactive sulfides found in typical GL-5 oils. With its optimal viscosity and American-made quality, it ensures superior gear protection, corrosion prevention, and smooth shifting for professional-grade vehicle maintenance.

## Description

Oil (50304) MT-90 75W-90 GL-4 Manual Transmission and Trans axle Lubricant - 1 Quart

## Features

- Safe for brass synchros, as it lacks the reactive sulfides found in most GL-5 oils that cause damage

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | Red Line |
| Package Information | Bottle |
| Liquid Volume | 32 Fluid Ounces |
| Item Weight | 1.7 Pounds |
| Recommended Uses For Product | Manual transmissions, Transaxles |
| Viscosity | 75W-90 |
| Specific Uses For Product | Prevent Corrosion, Manual Transmission, Trans Axle |
| Item Form | Oil |
| Global Trade Identification Number | 00083522503044 |
| Manufacturer | Redline |
| Net Quantity | 32.0 Fluid Ounces |
| UPC | 083522503044 |
| Number of Items | 1 |
| Model | MT90 75W90 GL4 QT |
| Product Dimensions | 22.86 x 10.16 x 10.16 cm; 771.11 g |
| Item model number | 50304 |
| Manufacturer Part Number | 50304 |
| OEM Part Number | 50304 |
| Volume | 1 Quarts |
| Assembly Required | No |
| Country of Origin | USA |
| Item Weight | 771 g |

## Product Details

- **Brand:** Red Line
- **Package Information:** Bottle
- **Liquid Volume:** 32 Fluid Ounces
- **Item Weight:** 1.7 Pounds
- **Recommended Uses For Product:** Manual transmissions, Transaxles

## Images

![Oil (50304) MT-90 75W-90 GL-4 Manual Transmission and Trans axle Lubricant - 1 Quart - Image 1](https://m.media-amazon.com/images/I/61iZ6pnD7aL.jpg)

## Questions & Answers

**Q: Is anyone running this in an NV4500 long term? How does it hold up?**
A: I've been running it for 35,000 miles in my 1996 model GM NV4500 without issue.

**Q: Do I pour the entire contents directly in?  Are there any special instructions?**
A: To get maximum benefit of the Red Line you need to replace all the oil in the transmission.  For my car, it took 3.4 quarts so I bought four and filled it up until fluid was level with the bottom of the fill plug.  If you go to the Red Line website, they have which transmission oil is correct for your car and the capacity of the transmission so you will know how much you will need.

**Q: Is this product non-synthetic gl-3?**
A: Synthetic gl -4 oil

**Q: Can i use on 1992 chevy camaro rs?**
A: I would not. It is supposed to be OEM recommended for my 98 vw Cabrio 5speed. So Put $46 worth in and at0°F I could not shift the car until 30 minutes of idling. second Synchromesh was very fussy at 20deg

## Frequently Bought Together

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

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**Shop now:** [https://www.desertcart.fi/products/180466380-oil-50304-mt-90-75w-90-gl-4-manual-transmission](https://www.desertcart.fi/products/180466380-oil-50304-mt-90-75w-90-gl-4-manual-transmission)

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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-02-24*