---
product_id: 5797130
title: "Red Line 80301 Limited Slip Friction Modifier - 4 Ounce"
brand: "red line"
price: "€ 24.25"
currency: EUR
in_stock: true
reviews_count: 13
category: "Red Line"
url: https://www.desertcart.sk/products/5797130-red-line-80301-limited-slip-friction-modifier-4-ounce
store_origin: SK
region: Slovakia
---

# Boosts differential efficiency & mileage High Viscosity-Index for stable performance Superior wear protection & longer drain intervals Red Line 80301 Limited Slip Friction Modifier - 4 Ounce

**Brand:** red line
**Price:** € 24.25
**Availability:** ✅ In Stock

## Summary

> 🛠️ Unlock your ride’s true potential with Red Line’s friction modifier—because smooth is the new fast!

## Quick Answers

- **What is this?** Red Line 80301 Limited Slip Friction Modifier - 4 Ounce by red line
- **How much does it cost?** € 24.25 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/5797130-red-line-80301-limited-slip-friction-modifier-4-ounce)

## 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

- • **Universal Compatibility:** Works seamlessly with both petroleum and synthetic gear oils—flexibility that fits your maintenance routine.
- • **Smooth, Chatter-Free Ride:** Add 1oz increments to eliminate annoying limited slip chatter—feel the difference on every turn.
- • **Thermal Stability Mastery:** High viscosity-index formula maintains consistent film thickness across temperature swings for reliable performance.
- • **Trusted Legacy of Excellence:** Since 1979, Red Line delivers uncompromising quality that professionals rely on for peak vehicle performance.
- • **Precision Engineered Protection:** Maximize your differential’s lifespan with advanced friction modifiers that reduce wear and extend drain intervals.

## Overview

Red Line 80301 Limited Slip Friction Modifier is a 4-ounce high-viscosity additive designed to enhance differential efficiency by reducing clutch chatter, improving mileage, and extending oil drain intervals. Compatible with both synthetic and petroleum gear oils, it meets and exceeds API GL-5 standards, ensuring consistent performance across temperature variations. Trusted by professionals since 1979, this product delivers superior wear protection and smooth limited slip operation.

## Description

Buy Red Line 80301 Limited Slip Friction Modifier - 4 Ounce: Touchup Paint - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Add 1 Ounce then do several figure 8's in a parking lot. - Worked like a charm but you have to spend 20 minutes doing figure 8's at slow speed. Solved the drag sound.
Review: This is a review of the seller not the product. - As always Red Line is a top tier product. I use Red Line 75W90ns gear oil for the rear diff in the race car the ns in the oil name stands for Non-Limited Slip. That way I can add the Limited Slip Friction Modifier and I can fine tune the slip/grip that the rear tires get. This came from the Red Line store so I was fairly certain it would get to me on time. It was supposed to arrive in 5 to 7 days but it only took 2 days. None of my local stores had this in stock and it was going to be weeks before they could get it.

## Features

- ENGINEERED - to provide the highest degree of protection and improvement of differential efficiency for better mileage, longer drain intervals, and less wear
- DIRECTION - Add 1oz at a time to clutch-type limited slip or posi-traction units to eliminate chatter
- HIGH VISCOSITY-INDEX - to provide relatively constant viscosity and film thickness with varying temperature change, exceed API GL-5 specifications
- COMPATIBLE WITH - both petroleum and synthetic gear oils
- WHY RED LINE - Established in 1979, Red Line Products perform & protect better than any on the market. No compromises

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000CPCBGE |
| Best Sellers Rank | #244,188 in Automotive ( See Top 100 in Automotive ) #185 in Engine & Oil Fluid Additives |
| Brand | Red Line |
| Customer Reviews | 4.5 4.5 out of 5 stars (294) |
| Date First Available | July 3, 2009 |
| Global Trade Identification Number | 00083522803014 |
| Is Discontinued By Manufacturer | No |
| Item Form | Oil |
| Item Weight | 4.2 ounces |
| Item model number | 80301 |
| Liquid Volume | 4 Fluid Ounces |
| Manufacturer | Red Line |
| Manufacturer Part Number | 80301 |
| Material | Polytetrafluoroethylene |
| Number of Items | 1 |
| OEM Part Number | 80301 |
| Package Information | Bottle |
| Product Dimensions | 2.35 x 2.25 x 4.7 inches |
| Recommended Uses For Product | Anti-Friction |
| UPC | 083522803014 |
| Unit Count | 4.0 Fluid Ounces |
| Viscosity | High |
| Viscosity Level | High |

## Product Details

- **Brand:** Red Line
- **Liquid Volume:** 4 Fluid Ounces
- **Material:** Polytetrafluoroethylene
- **Package Information:** Bottle
- **Recommended Uses For Product:** Anti-Friction

## Images

![Red Line 80301 Limited Slip Friction Modifier - 4 Ounce - Image 1](https://m.media-amazon.com/images/I/71auZeP6jKL.jpg)

## Questions & Answers

**Q: Would the 95 Isuzu 4x4 front differential benefit from this additive? I know the rear limited slip diff does!**
A: No, unless it's a limited slip after market and specifies such. On the rear positive,  too much would cause slippage between the plates.  Just ad enough to stop the clanging.  Too much would lesson the Limited slip .

**Q: Can this be used in redlline dct fluid that is used in a manual tranmission with lsd?**
A: It was purchased for my son.  I didn't use it.  My son is a car mechanic, so I think it is a good product.

**Q: Would this help a 95 Isuzu front 4x4 differential? ...that chatters around corners on pavement?**
A: Check your u-joints but if there ok. Let me know if it worked. Differential Gear oil is supposed to be replaced on a regular Preventative maintenance Schedule. I don’t know what the mileage is on your car is but it couldn’t hurt “unless your vehicle is not a LSD Diff.” Thanks!

**Q: do I need that for my 99 chevy express 1500 V8  with amsoil 80W90 together?**
A: My chevy Silverado 2500HD ran better after adding a 4oz. can of Redline with the rear gear oil. There is also an additive for the transfer case GM put in during a service. I would double check before putting that in the transfer case. Keep on reading, you'll find the answer. Good Luck

## Customer Reviews

### ⭐⭐⭐⭐⭐ Add 1 Ounce then do several figure 8's in a parking lot.
*by J***N on December 10, 2023*

Worked like a charm but you have to spend 20 minutes doing figure 8's at slow speed. Solved the drag sound.

### ⭐⭐⭐⭐⭐ This is a review of the seller not the product.
*by D***S on August 11, 2022*

As always Red Line is a top tier product. I use Red Line 75W90ns gear oil for the rear diff in the race car the ns in the oil name stands for Non-Limited Slip. That way I can add the Limited Slip Friction Modifier and I can fine tune the slip/grip that the rear tires get. This came from the Red Line store so I was fairly certain it would get to me on time. It was supposed to arrive in 5 to 7 days but it only took 2 days. None of my local stores had this in stock and it was going to be weeks before they could get it.

### ⭐⭐⭐⭐⭐ Works great
*by M***. on November 4, 2022*

Helps with the rear end noise

## Frequently Bought Together

- Red Line 80301 Limited Slip Friction Modifier - 4 oz.
- Sealey AK54 550ml Oil Suction Syringe, Multicoloured

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**Shop now:** [https://www.desertcart.sk/products/5797130-red-line-80301-limited-slip-friction-modifier-4-ounce](https://www.desertcart.sk/products/5797130-red-line-80301-limited-slip-friction-modifier-4-ounce)

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*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-03-04*