---
product_id: 339728773
title: "Red Line 50505 MT-85 75W85 GL-4-1 gallon, 1 Pack"
brand: "red line"
price: "$351.67"
currency: USD
in_stock: true
reviews_count: 6
category: "Red Line"
url: https://www.desertcart.us/products/339728773-red-line-50505-mt-85-75w85-gl-4-1-gallon
store_origin: US
region: United States of America
---

# 75W85 GL-4 viscosity for optimal gear protection Smooth shifting even in cold climates Safe for brass synchros, no reactive sulfurs Red Line 50505 MT-85 75W85 GL-4-1 gallon, 1 Pack

**Brand:** red line
**Price:** $351.67
**Availability:** ✅ In Stock

## Summary

> ⚙️ Shift smarter, not harder — gear oil that keeps you ahead of the pack!

## Quick Answers

- **What is this?** Red Line 50505 MT-85 75W85 GL-4-1 gallon, 1 Pack by red line
- **How much does it cost?** $351.67 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/339728773-red-line-50505-mt-85-75w85-gl-4-1-gallon)

## 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

- • **Brass Synchro Safe:** Formulated without damaging sulfurs for maximum transmission longevity
- • **Effortless Cold Shifts:** Balanced friction control ensures smooth shifting in any weather
- • **Trusted by Enthusiasts:** Preferred choice for Nissan 350Z/370Z, Mitsubishi Evo, Hyundai & more
- • **Precision Gear Protection:** Extends synchro and gear life with advanced GL-4 formula
- • **Proven Performance Legacy:** Since 1979, Red Line delivers uncompromising synthetic quality

## Overview

Red Line 50505 MT-85 is a premium 75W85 GL-4 synthetic gear oil designed for superior gear and synchro protection, ensuring quicker, smoother shifts even in cold climates. Safe for brass synchros and recommended for a wide range of manual transmissions including Nissan, Mitsubishi, Hyundai, and Kia models, it leverages advanced ester base stocks for extreme stability and durability. Trusted by performance enthusiasts since 1979, this gear oil delivers uncompromising quality and longevity.

## Description

Since 1979, Red Line Synthetic Oil has grown to manufacture more than 100 quality products, including motor oils, gear oils, assembly lubes, fuel additives, and its popular Water Wetter cooling additive for the automotive, motorcycle, marine, and industrial markets. Red Line has a reputation with racers and enthusiasts alike for creating products that perform and protect better than any on the market, regardless of price. The company brings a knowledge of available technologies and responds to technical challenges, satisfying the high demands of the performance industry. Red Line's employees are enthusiasts that stay on top of each racing and performance niche, ensuring that product recommendations allow customers make the significant performance gains. Red Line formulates fully-synthetic oils and chemically-advanced additives using the world's finest base stocks. Rather than cutting costs by blending in petroleum products, Red Line's motor oils and gear oils use superior ester base stocks that provide extreme stability at high temperatures and superior film strength at lower viscosities where more power can be produced.

Review: Great product! Worth the money! - Product exactly as described...great product A++
Review: Mejor aceite del mundo. 100% sintetico. Lo compre para un volvo s60 que en invierno cuando arrancava el coche el canvio iva tan duro que tenia que poner la marcha casi a golpes no se que aceite llevava pero ahora va igual de fino en frio bajo como en caliente.

## Features

- HIGH PERFORMANCE - Gear protection and longer synchro life. Recommended for GL-1, GL-3, and GL-4 applications, as well as where most special synchromesh fluids are specified
- OFFERS QUICKER SHIFTS - Excellent gear and synchro protection, balanced friction control & slipperiness for easier shifting even in cold climates
- SAFE FOR BRASS SYNCHROS - GL-4 Gear Oil lacks the reactive sulfurs found in most GL-5 oils that cause damage. Recommended for GL-1, GL-3 & GL-4 applications
- POPULAR GEA OIL FOR - Nissan 350Z and 370Z (also most Maxima, Altima & Sentra), Mitsubishi Evolution, Hyundai, Kia and Quaife synchro manual trans applications
- WHY RED LINE - Established in 1979, Red Line Products perform & protect better than any on the market. No compromises

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B019XB6FQO |
| Best Sellers Rank | #40,025 in Automotive ( See Top 100 in Automotive ) #489 in Automotive Oils |
| Brand Name | Red Line |
| Container Type | Can |
| Customer Reviews | 4.8 4.8 out of 5 stars (838) |
| Global Trade Identification Number | 00083522505055 |
| Included Components | MT-85 75W85 GL-4 - 1 gallon |
| Item Form | Oil |
| Item Type Name | MT-85 75W85 GL-4 - 1 gallon |
| Item Weight | 7 Pounds |
| Liquid Volume | 128 Fluid Ounces |
| Manufacturer | Red Line |
| Material | Synthetic |
| Model Number | 50505 |
| Number of Items | 1 |
| Part Interchange Info | 50505 |
| Part Number | 50505 |
| Recommended Uses For Product | Automotive |
| Specific Uses For Product | Manual transmission lubrication, specific vehicle models and transmissions |
| UPC | 083522505055 |
| Unit Count | 3785.41 Milliliters |
| Viscosity | 75W-85 |

## Product Details

- **Brand:** Red Line
- **Item weight:** 7 Pounds
- **Liquid volume:** 128 Fluid Ounces
- **Material:** Synthetic
- **Package information:** Can

## Images

![Red Line 50505 MT-85 75W85 GL-4-1 gallon, 1 Pack - Image 1](https://m.media-amazon.com/images/I/71ah1WZ0rnL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: Help. I have 09 Tacoma 5 speed manual will this item work or any other recommendation?**
A: If owners manual calls for a GL-4 oil then yes this is will be fine. Dont use GL-5 in a transmission that calls for GL-4. Sulpher in the oil will destroy the brass synchros and brass washers and parts. Redline is great but its not a miracle oil.

**Q: work on 370z ?**
A: MT-85 is specifically designed for the 370z. Take a look here: http://www.the370z.com/diy-section-do-yourself/8311-diy-transmission-oil-change.html

**Q: Will this be compatible with my 2014 F34 335i rear non-limited slip differential?**
A: This is not the correct fluid. You need 75w90 and this is 75w85. it's close but not the same. I would recommend the BMW Specific fluid for your car that is the correct spec.

**Q: Can it use with Vespa Paige 50cc?**
A: I purchased this oil for an older Hyundai with a manual transmission. I believe it is a formula specifically for Korean cars, and it worked remarkably well. With that said, I don't see where Vespa calls for this viscosity. Personally, I would stick with what they recommend.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great product! Worth the money!
*by G***A on 11 April 2020*

Product exactly as described...great product A++

### ⭐⭐⭐⭐⭐ Review
*by J***Y on 30 January 2026*

Mejor aceite del mundo. 100% sintetico. Lo compre para un volvo s60 que en invierno cuando arrancava el coche el canvio iva tan duro que tenia que poner la marcha casi a golpes no se que aceite llevava pero ahora va igual de fino en frio bajo como en caliente.

### ⭐⭐⭐⭐⭐ Review
*by A***L on 3 December 2025*

Worked well in our 08 Nissan Frontier 6 Speed Manual. Smooth shifting and GL4 spec to protect the syncro rings.

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-05-10*