---
product_id: 339728773
title: "50505 MT-85 75W85 GL-4-1 gallon, 1 Pack"
brand: "red line"
price: "63954 kr"
currency: ISK
in_stock: true
url: https://www.desertcart.is/products/339728773-50505-mt-85-75w85-gl-4-1-gallon-1-pack
store_origin: IS
region: Iceland
---

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

**Brand:** red line
**Price:** 63954 kr
**Availability:** ✅ In Stock

## Summary

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

## Quick Answers

- **What is this?** 50505 MT-85 75W85 GL-4-1 gallon, 1 Pack by red line
- **How much does it cost?** 63954 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/products/339728773-50505-mt-85-75w85-gl-4-1-gallon-1-pack)

## 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

Red Line 50505 MT-85 75W85 GL-4-1 gallon, 1 Pack

## 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

## Product Details

- **Material:** Synthetic
- **Brand:** Red Line
- **Package information:** Can
- **Liquid volume:** 128 Fluid Ounces
- **Item weight:** 3.18 kg

## Images

![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.

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**Shop now:** [https://www.desertcart.is/products/339728773-50505-mt-85-75w85-gl-4-1-gallon-1-pack](https://www.desertcart.is/products/339728773-50505-mt-85-75w85-gl-4-1-gallon-1-pack)

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*Product available on Desertcart Iceland*
*Store origin: IS*
*Last updated: 2026-03-15*