---
product_id: 269584796
title: "Red Line 50305 MT-90 75W90 GL-4 Gear Oil - 1 Gallon"
brand: "red line"
price: "₨111873"
currency: LKR
in_stock: true
reviews_count: 5
category: "Red Line"
url: https://www.desertcart.lk/products/269584796-red-line-50305-mt-90-75w90-gl-4-gear-oil
store_origin: LK
region: Sri Lanka
---

# Eliminates gear whine & rattle at high temps 75W90 GL-4 viscosity for optimal gear protection Smooth shifting performance even when cold Red Line 50305 MT-90 75W90 GL-4 Gear Oil - 1 Gallon

**Brand:** red line
**Price:** ₨111873
**Availability:** ✅ In Stock

## Summary

> ⚙️ Shift Like a Pro, Ride Like You Own It

## Quick Answers

- **What is this?** Red Line 50305 MT-90 75W90 GL-4 Gear Oil - 1 Gallon by red line
- **How much does it cost?** ₨111873 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/products/269584796-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

- • **Cold-Start Champion:** Maintains excellent shifting performance in low temperatures, so you’re always ready to roll.
- • **High-Temp Gear Whisperer:** Eliminates gear whine and rattle even under intense heat, ensuring a quiet, smooth ride.
- • **Effortless Shifting Mastery:** Say goodbye to notchy, frustrating gear changes with perfectly balanced slipperiness.
- • **Synchronizer-Friendly Formula:** Non-corrosive to synchronizers, preserving transmission longevity and peak performance.
- • **Engineered for Manual Transmissions:** Specifically designed for manual gearboxes and transaxles requiring GL-4 or motor oil compatibility.

## Overview

Red Line 50305 MT-90 is a premium 75W90 GL-4 gear oil designed for manual transmissions and transaxles. It delivers superior gear and synchronizer protection, eliminates notchy shifting, and reduces gear noise at high temperatures. Engineered for smooth, reliable shifting even in cold conditions, this lubricant ensures your manual transmission performs flawlessly under all driving scenarios.

## 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 transaxles. 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 transaxles 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 transaxles requiring motor oils or GL-1, GL-3, or GL-4 gear oils.

Review: Worth the price.
Review: Ottimo prodotto - Ottimo prodotto

## Features

- manufacturer: Generic
- Item Trademark: GENERIC
- Item Weight: pounds, pounds, 7.00, 7.00
- Item Category: Machine Lubricant

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Red Line |
| Brand | Red Line |
| Product Dimensions | 19.05 x 10.16 x 28.58 cm; 2.27 kg |
| Item model number | 50305 |
| Manufacturer Part Number | 50305 |
| OEM Part Number | 50305 |
| Item Weight | 2.27 Kilograms |
| Viscosity | 75W90 GL-4 |

## Product Details

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

## Images

![Red Line 50305 MT-90 75W90 GL-4 Gear Oil - 1 Gallon - 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

## Customer Reviews

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



### ⭐⭐⭐⭐⭐ Ottimo prodotto
*by M***. on 29 August 2024*

Ottimo prodotto

### ⭐⭐⭐⭐⭐ Performance oil
*by R***S on 15 May 2025*



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*Product available on Desertcart Sri Lanka*
*Store origin: LK*
*Last updated: 2026-03-02*