---
product_id: 5797128
title: "58204 Heavy Shockproof Gear Oil - 1 Quart"
brand: "red line"
price: "€ 51.00"
currency: EUR
in_stock: true
reviews_count: 13
category: "Red Line"
url: https://www.desertcart.fr/products/5797128-58204-heavy-shockproof-gear-oil-1-quart
store_origin: FR
region: France
---

# Longer drain intervals Exceeds API GL-5 for extreme protection Polyol ester synthetic base 58204 Heavy Shockproof Gear Oil - 1 Quart

**Brand:** red line
**Price:** € 51.00
**Availability:** ✅ In Stock

## Summary

> ⚡ Shift into the fast lane with shockproof gear oil that outperforms and outlasts.

## Quick Answers

- **What is this?** 58204 Heavy Shockproof Gear Oil - 1 Quart by red line
- **How much does it cost?** € 51.00 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fr](https://www.desertcart.fr/products/5797128-58204-heavy-shockproof-gear-oil-1-quart)

## 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

- • **Extended Service Life:** Formulated to support longer drain intervals, reducing maintenance downtime and costs.
- • **Trusted Legacy Since 1979:** Red Line’s heritage guarantees uncompromising quality and performance in every quart.
- • **Race-Proven Synthetic Power:** Engineered from advanced polyol ester base stocks for unmatched lubrication under extreme conditions.
- • **Precision Fit for Open Diffs:** Optimized for open differentials and air lockers—perfect for performance enthusiasts who demand quiet, cool operation.
- • **Ultimate Differential Defense:** Delivers superior wear protection and boosts differential efficiency for smoother rides and better mileage.

## Overview

Red Line 58204 Heavy Shockproof Gear Oil is a fully synthetic, polyol ester-based lubricant designed to exceed API GL-5 standards. Ideal for high-performance open differentials and racing applications, it reduces wear, improves differential efficiency, and extends drain intervals. Not suitable for synchro transmissions, this premium gear oil delivers quieter, cooler operation trusted by professionals since 1979.

## Description

Buy Red Line 58204 Heavy Shockproof Gear Oil - 1 Quart: Engine & Oil - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Great product - This is very good for Harley transmissions. Shifts smooth. Easy to find neutral.
Review: Highly recommended for Subaru open diffs. - Used this in my 1999 Subaru Impreza Outback Sport with noisy front and rear differentials. I threw some mobil0-1 75w-90 in each diff for about 1k miles to rinse things out. Just dropping the beat-up, dark diff fluid and going to Mobil 1 was a marked improvement alone. After running that sacrificial fluid for 1k miles, I drained it (and it was in much better shape, but still appeared QUITE DIRTY) and installed some Lucas full synthetic 75w-90 gear oil with about a half of the Heavy Shockproof quart going into the front and a half going into the rear diff. I put the Redline in first so it would mix better. Both my front and rear differentials are OPEN (not LSD; if you have an LSD, DO NOT USE this redline shockproof series). Immediately, I noticed that the diffs were notably quieter and that the car even accelerated and coasted more easily than even with the mobil-1 gear oil. I used the heavy shockproof because I'm in Florida and it never gets very cold here (it dips below freezing for a few hours, a few nights of the year, but only just below). If you are not in a southern state (FL, Texas, AZ, NM, LA, etc), I would advise selecting the lightweight shockproof instead. Overall, I'm extremely satisfied. If you have an open diff, or an air locker (anything but an LSD), you owe it to yourself to add a portion of shockproof to your diff. Quieter means cooler. That's always a good thing. Also, NEVER add this to any transmission. Even a manual. Your synchros will be permanently too slippery to work properly.

## Features

- FULLY-SYNTHETIC FORMULAS - created from polyol ester base stocks, offer excellent lubrication under extreme conditions
- ENGINEERED TO PROVIDE - the highest degree of protection and improvement of differential efficiency for better mileage, longer drain intervals, and less wear, exceed API GL-5 specifications
- NOT RECOMMENDED - for most synchro applications due to the product's extreme slipperiness
- POPULAR GEAR OIL FOR - Many performance racing applications like Sprint, Midget, Dirt Late Model and Quick Change Differentials, Detroit Lockers and spools, NHRA Top Fuel and Funny Car rear ends, most popular ShockProof product, many racing and specialty 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 | B000CPI5XW |
| Best Sellers Rank | #42,806 in Automotive ( See Top 100 in Automotive ) #72 in Engine & Oil Fluid Additives |
| Brand | Red Line |
| Customer Reviews | 4.8 4.8 out of 5 stars (985) |
| Date First Available | July 20, 2005 |
| Exterior | Painted |
| Global Trade Identification Number | 00083522582049 |
| Is Discontinued By Manufacturer | No |
| Item Form | Oil |
| Item Weight | 1.7 pounds |
| Item model number | 58204 |
| Liquid Volume | 32 Fluid Ounces |
| Manufacturer | Red Line |
| Manufacturer Part Number | 57-6525 |
| Material | Synthetic |
| Model | Red Line 57-6525 |
| Number of Items | 1 |
| OEM Part Number | 58204 |
| Package Information | Bottle |
| Product Dimensions | 9 x 3.89 x 3.87 inches |
| Recommended Uses For Product | Gear Oil |
| SAE J300 Viscosity Grade | 75W-90 |
| UPC | 083522582049 083522582094 |
| Unit Count | 32.0 Fluid Ounces |

## Product Details

- **Brand:** Red Line
- **Item Weight:** 1.7 Pounds
- **Liquid Volume:** 32 Fluid Ounces
- **Material:** Synthetic
- **Package Information:** Bottle

## Images

![58204 Heavy Shockproof Gear Oil - 1 Quart - Image 1](https://m.media-amazon.com/images/I/71GC5ofv8fL.jpg)

## Available Options

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

## Questions & Answers

**Q: What viscosity is this particular oil?**
A: Film thickness greater than an SAE 75W250, yet low fluid friction like 75W90For heavily-loaded racing differentials and transmissions, problem gearboxesMany performance racing applications like Sprint/Midget/Dirt Late Model Differentials, Detroit Lockers and spools, NHRA Top Fuel and Funny Car rear endsNot recommended for most synchro applications due to the product's extreme slipperiness

**Q: What is the viscosity of this? Need a specific number.**
A: Film thickness greater than an SAE 75W250, yet low fluid friction like 75W90. This is from the manufacturer's site.

**Q: Canged primary chain OIL of my 2002 RoadKing ScreamingEagle I made a MISTAKE! Added REDLINTransFluidw/Shockproof. IS It COMPATABLE**
A: I would think not.  As the primary runs a 20w 50 and the red line is something like 75 90 it's going to a lot thicker.  I would call a local Indy not HD and ask them for sure.

**Q: Is this GL5?**
A: It exceeds API GL-5 specifications.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great product
*by D***O on January 3, 2026*

This is very good for Harley transmissions. Shifts smooth. Easy to find neutral.

### ⭐⭐⭐⭐⭐ Highly recommended for Subaru open diffs.
*by T***Y on November 1, 2016*

Used this in my 1999 Subaru Impreza Outback Sport with noisy front and rear differentials. I threw some mobil0-1 75w-90 in each diff for about 1k miles to rinse things out. Just dropping the beat-up, dark diff fluid and going to Mobil 1 was a marked improvement alone. After running that sacrificial fluid for 1k miles, I drained it (and it was in much better shape, but still appeared QUITE DIRTY) and installed some Lucas full synthetic 75w-90 gear oil with about a half of the Heavy Shockproof quart going into the front and a half going into the rear diff. I put the Redline in first so it would mix better. Both my front and rear differentials are OPEN (not LSD; if you have an LSD, DO NOT USE this redline shockproof series). Immediately, I noticed that the diffs were notably quieter and that the car even accelerated and coasted more easily than even with the mobil-1 gear oil. I used the heavy shockproof because I'm in Florida and it never gets very cold here (it dips below freezing for a few hours, a few nights of the year, but only just below). If you are not in a southern state (FL, Texas, AZ, NM, LA, etc), I would advise selecting the lightweight shockproof instead. Overall, I'm extremely satisfied. If you have an open diff, or an air locker (anything but an LSD), you owe it to yourself to add a portion of shockproof to your diff. Quieter means cooler. That's always a good thing. Also, NEVER add this to any transmission. Even a manual. Your synchros will be permanently too slippery to work properly.

### ⭐⭐⭐⭐⭐ Great stuff.
*by R***! on October 3, 2025*

It is awesome... buy some today. I put this in my Baker 6 speed on my custom V Twin... So far so good....

## Frequently Bought Together

- Red Line 58204 Heavy Shockproof Gear Oil - 1 Quart
- Red Line 42904 V-Twin Primary Case Oil, for use with UTVs, ATVs and Sportbikes - 1 Quart
- K&N Motorcycle Oil Filter: High Performance, Premium, Designed to be used with Synthetic or Conventional Oils, Wrench Off Nut: Fits Select Harley Davidson Motorcycles, KN-171B

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---

*Product available on Desertcart France*
*Store origin: FR*
*Last updated: 2026-02-26*