---
product_id: 257386191
title: "50504 MT-85 Manual Transmission 75W85 GL-4 Gear Oil - 1 Quart"
brand: "red line"
price: "$112"
currency: NZD
in_stock: true
reviews_count: 6
category: "Red Line"
url: https://www.desertcart.nz/products/257386191-50504-mt-85-manual-transmission-75w85-gl-4-gear-oil
store_origin: NZ
region: New Zealand
---

# 75W85 GL-4 viscosity grade Cold climate smooth shifting Brass synchro safe formula 50504 MT-85 Manual Transmission 75W85 GL-4 Gear Oil - 1 Quart

**Brand:** red line
**Price:** $112
**Availability:** ✅ In Stock

## Summary

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

## Quick Answers

- **What is this?** 50504 MT-85 Manual Transmission 75W85 GL-4 Gear Oil - 1 Quart by red line
- **How much does it cost?** $112 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/257386191-50504-mt-85-manual-transmission-75w85-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

- • **Effortless Shifting:** Balanced friction for quicker, smoother gear changes even in cold weather
- • **Legacy of Excellence:** Red Line’s proven performance since 1979—no compromises on quality
- • **Synchro-Safe Chemistry:** No reactive sulfurs to harm brass synchros—ideal for high-performance manuals
- • **Versatile Compatibility:** Trusted by Nissan 350Z/370Z, Mitsubishi Evo, Hyundai, Kia & Quaife setups
- • **Precision Gear Protection:** Extends synchro life with advanced GL-4 formula

## Overview

Red Line 50504 MT-85 is a premium 75W85 GL-4 manual transmission gear oil designed for superior gear and synchro protection. It ensures quicker, smoother shifts with balanced friction control, especially in cold climates, while being safe for brass synchros. Compatible with a wide range of performance and everyday manual transmissions, this oil delivers trusted, long-lasting performance backed by Red Line’s decades of expertise.

## Description

Red Line Oil 50504 Redline Manual Trans 85 -Qt. Manual transmission gear lube 75W85 GL-4 that offers quicker shifts, improved coefficient of friction, and better gear protection. Also offers better cold shifting and works with high and low mileage vehicles.

Review: Great product! Worth the money! - Product exactly as described...great product A++
Review: Worked well in our 08 Nissan Frontier 6 Speed Manual. Smooth shifting and GL4 spec to protect the syncro rings.

## 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 | B004D4URV6 |
| Best Sellers Rank | #36,788 in Automotive ( See Top 100 in Automotive ) #499 in Automotive Oils |
| Item model number | RED50504 |
| Manufacturer | Red Line |
| Product Dimensions | 33.02 x 15.24 x 15.24 cm; 884.51 g |

## Product Details

- **Brand:** Red Line
- **Item weight:** 885 g
- **Liquid volume:** 32 Fluid Ounces
- **Material:** Polyol Ester
- **Package information:** Bottle

## Images

![50504 MT-85 Manual Transmission 75W85 GL-4 Gear Oil - 1 Quart - Image 1](https://m.media-amazon.com/images/I/71eCG2BDySL.jpg)

## Customer Reviews

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

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

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐⭐ Review
*by M***N on 9 June 2024*

Mein Getriebe (Opel Corsa D) ließ sich gerade im ersten Gang nur mäßig schalten. Die Schaltbarkeit hat sich nach dem Wechsel wesentlich verbessert. Auch die Geräuschkulisse ist deutlich ruhiger. Klare Empfehlung 👍🏻

## Frequently Bought Together

- Red Line 50504 MT-85 Manual Transmission 75W85 GL-4 Gear Oil - 1 Quart
- Red Line 50504 MT-85 Manual Transmission 75W85 GL-4 Gear Oil - 1 Quart (4 Pack)
- 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.nz/products/257386191-50504-mt-85-manual-transmission-75w85-gl-4-gear-oil](https://www.desertcart.nz/products/257386191-50504-mt-85-manual-transmission-75w85-gl-4-gear-oil)

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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-02-14*