---
product_id: 53635750
title: "Red Line 50305 MT-90 75W90 GL-4 Gear Oil - 1 Gallon by Red Line Oil"
brand: "red line"
price: "1538 Lei"
currency: RON
in_stock: true
category: "Red Line"
url: https://www.desertcart.ro/products/53635750-red-line-50305-mt-90-75w90-gl-4-gear-oil
store_origin: RO
region: Romania
---

# GL-4 rating ensures superior gear compatibility 75W90 viscosity for optimal gear protection 1 Gallon bulk size for extended use Red Line 50305 MT-90 75W90 GL-4 Gear Oil - 1 Gallon by Red Line Oil

**Brand:** red line
**Price:** 1538 Lei
**Availability:** ✅ In Stock

## Summary

> ⚙️ Shift into high gear with Red Line’s ultimate drivetrain defense!

## Quick Answers

- **What is this?** Red Line 50305 MT-90 75W90 GL-4 Gear Oil - 1 Gallon by Red Line Oil by red line
- **How much does it cost?** 1538 Lei with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/53635750-red-line-50305-mt-90-75w90-gl-4-gear-oil)

## 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

- • **Bulk Supply Advantage:** 1-gallon container means fewer refills and more uptime for your vehicle maintenance
- • **Durability Under Pressure:** Formulated to reduce wear and extend the life of your drivetrain components
- • **Professional Grade Formula:** Trusted by mechanics and enthusiasts for consistent, high-performance lubrication
- • **Precision Viscosity Control:** 75W90 grade delivers smooth shifting and robust gear protection under extreme conditions
- • **Certified Gear Compatibility:** GL-4 rating guarantees optimal performance with a wide range of manual transmissions

## Overview

Red Line 50305 MT-90 75W90 GL-4 Gear Oil is a professional-grade lubricant designed for manual transmissions and differentials. Packaged in a convenient 1-gallon container, it offers superior wear protection and smooth gear operation thanks to its 75W90 viscosity and GL-4 certification. Ideal for serious vehicle maintenance, it ensures longevity and reliability under demanding conditions.

## Description

Red Line 50305 MT-90 75W90 GL-4 Gear Oil - 1 Gallon by Red Line Oil : desertcart.co.uk: Automotive

## Features

- Harmful to aquatic life with long lasting effects.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Oeream |
| Part number | 50305 |
| Item Weight | 2.27 kg |
| Product Dimensions | 19.05 x 10.16 x 28.58 cm; 2.27 Kilograms |
| Item model number | 50305 |
| Item Package Quantity | 1 |
| Batteries included? | No |
| Batteries Required? | No |

## Product Details

- **Brand:** Red Line
- **Item weight:** 2.27 Kilograms
- **Liquid volume:** 128 Fluid Ounces
- **Material:** Oil
- **Package information:** Bottle

## Images

![Red Line 50305 MT-90 75W90 GL-4 Gear Oil - 1 Gallon by Red Line Oil - Image 1](https://m.media-amazon.com/images/I/71oe7Mrgl5L.jpg)

## Questions & Answers

**Q: Can you mix gl-4 gear oil with gl-5 gear oil? what is difference? if do 50/50....will be good together? why or why not?**
A: NO NO NO...  GL-4 is specific for older transmissions that have bronze/brass parts. GL-5 will DESTROY these parts.. believe me I know from experience. My local speed shop mistakenly gave me GL-5 for my 91 YJ with the X-5 trans.  Within ten miles I could smell the problem happening. They honored the mistake and gave me a gallon of correct GL-4 so at 150K my X5 was shifting much better. It's in the shop now at 185K for a trans rebuild (yeah it lasted THAT long) and Troy Transmissions was pleased to hear I wanted Redline. He insists on synthetics for Arizona heat and drivers who get in extreme conditions, look up the "back way to Crown King" for an idea of our kind of fun.  And a heads up for the Y owners... beware the fast lube places.  I went to two different shops and BOTH insisted GL-5 was the correct lube!!!  NOT! Luckily the $450 they wanted just to change fluids scared me off and I did what Jeepers should do... work on your own rig yourself.

**Q: why do many say to not change the old gear oil & that the "gunk" in old gear oil makes transmssion last longer & might have problems with new gear oil**
A: What they are referring to is automatic transmission fluid. Automatic transmissions have a series of "bands" with clutch like materials bonded to the friction side. On a worn out automatic transmission, the friction materials on these bands are already smoothed out and slip. Since automatic transmission are driven by hydraulic pressure, the "gunk" suspended inside old fluid will help with "gripping" action with these band. This redline gear oil is used in Manual transmissions. The old saying would not apply here.

**Q: Is MT 90 good for a 1995 jeep yj manual transmission?**
A: Yes, great product; bought the vehicle used and it was not sure what  type of fluid it had in the transmission. The jeep sounded like a bus and once I added the MT-90; big difference and most importantly much quietly.

**Q: Is this product compatible with my 1975 vw beetle, type 1 which spec's 85w/90 gl-4 gear oil? or do you have a synthetic product that is?**
A: I would look on the Volkswagen site or call a Volkswagen service department you can fool around with weights on engine oil but I wouldn't put the wrong weight in on a transmission

## Frequently Bought Together

- Red Line 50305 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Gallon
- Slippery Pete Fluid Pump for Gallon Bottles and Wide Mouth Quart Bottles (Not for Standard Quart Bottles) - Transfer Gear Oil, Transmission and Differential Fluid, Antifreeze with This 30cc Hand Pump
- Red Line 57905 75W90 GL-5 Synthetic Gear Oil for Hypoid Limited Slip Differentials - 1 Gallon

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**Shop now:** [https://www.desertcart.ro/products/53635750-red-line-50305-mt-90-75w90-gl-4-gear-oil](https://www.desertcart.ro/products/53635750-red-line-50305-mt-90-75w90-gl-4-gear-oil)

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*Product available on Desertcart Romania*
*Store origin: RO*
*Last updated: 2026-02-03*