---
product_id: 3747152
title: "42904 V-Twin Primary Case Oil, for use with UTVs, ATVs and Sportbikes - 1 Quart"
brand: "red line"
price: "€ 76.84"
currency: EUR
in_stock: true
reviews_count: 13
url: https://www.desertcart.fr/products/3747152-42904-v-twin-primary-case-oil-for-use-with-utvs
store_origin: FR
region: France
---

# Reduces clutch temperature Friction-balanced formula Fits 1984+ V-Twin engines 42904 V-Twin Primary Case Oil, for use with UTVs, ATVs and Sportbikes - 1 Quart

**Brand:** red line
**Price:** € 76.84
**Availability:** ✅ In Stock

## Summary

> 🏁 Ride smoother, last longer — the clutch oil pros swear by!

## Quick Answers

- **What is this?** 42904 V-Twin Primary Case Oil, for use with UTVs, ATVs and Sportbikes - 1 Quart by red line
- **How much does it cost?** € 76.84 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/3747152-42904-v-twin-primary-case-oil-for-use-with-utvs)

## 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 Clutch Life:** Reduces wear and heat to keep your ride performing longer
- • **Proven V-Twin Fitment:** Designed for Evolution, Twin Cam, and similar aftermarket engines since 1984
- • **Precision Friction Balance:** Optimized clutch grip without slip for seamless power delivery
- • **Trusted Legacy Performance:** Red Line’s industry-leading formula since 1979 ensures uncompromised protection
- • **Versatile Powersports Compatibility:** Perfectly engineered for motorcycles, ATVs, and UTVs with wet-diaphragm clutches

## Overview

Red Line 42904 V-Twin Primary Case Oil is a friction-balanced synthetic oil designed specifically for 1984-to-present V-Twin American motorcycle engines and compatible powersports vehicles. It enhances clutch operation by reducing slip, wear, and temperature, extending clutch lifespan while delivering superior performance and protection in wet-diaphragm spring clutch systems.

## Description

Buy Red Line 42904 V-Twin Primary Case Oil, for use with UTVs, ATVs and Sportbikes - 1 Quart: Engine Oil - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Top notch oil - Probably the best primary fluid around. Clutch engages smoothly, and really quiets the mechanical noise. A note of caution when ordering. As others have noted, ckeck the amount of oil your specific bike needs. Several reviewers have models requiring 38 ounces. I’ve attaced a pic from my owners manual on a 2024 Streetglide with a Gen 2 M8. 34 ounces if filling from dry, 30 ounces if a wet refill. I assume the Gen 1 M8’s are the same. Can’t remember what it was on a Twin Cam.
Review: Redlind oils for the win ! - Ive tried different oils for my Harley in the past, but have long ago preferred Redline for all 3 holes.

## Features

- FRICTION BALANCED CASE OIL - Most synthetics are too slippery for clutch operation. Our V-Twin Primary Case Oil is a balanced oil limiting slip and performing a smoother operation
- BOOSTS VEHICLE PERFORMANCE - Improves clutch operation while reducing wear and temperature, providing a longer clutch lifespan
- PERFORM & PROTECT - This product is for use in the primary chaincase with wet-diaphragm spring clutches. Perfect for Motorcycles, ATVs, and Powersports
- PRIMARY CASE OIL - For 1984-to-present V-Twin American motorcycle engines, including Evolution, Twin Cam, and aftermarket engines of similar design
- WHY RED LINE - Established in 1979, Red Line Products perform & protect better than any on the market. No compromises

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0053O9EUA |
| Automotive Fit Type | Vehicle Specific Fit |
| Best Sellers Rank | #7,315 in Automotive ( See Top 100 in Automotive ) #109 in Motor Oils |
| Brand | Red Line |
| Brand Name | Red Line |
| Compatible with Vehicle Type | Car |
| Container Type | Bottle |
| Customer Reviews | 4.8 out of 5 stars 2,781 Reviews |
| Flash Point | 232 °C |
| Global Trade Identification Number | 00083522429047 |
| Included Components | V-Twin Primary Case Oil |
| Item Type Name | Motor Oils |
| Item Weight | 1.7 pounds |
| Liquid Volume | 32 fluid ounces |
| Manufacturer | Red Line |
| Manufacturer Part Number | 42904 |
| Model Number | 42904 |
| Number of Packs | 1 |
| Package Information | Bottle |
| Part Interchange Info | 42904 |
| Size | 1 Quart |
| UPC | 083522429047 |
| Unit Count | 32 Fluid Ounces |
| Vehicle Service Type | Car |

## Product Details

- **Brand:** Red Line
- **Flash Point:** 232 °C
- **Liquid Volume:** 32 fluid ounces
- **Package Information:** Bottle
- **Vehicle Service Type:** Car

## Images

![42904 V-Twin Primary Case Oil, for use with UTVs, ATVs and Sportbikes - 1 Quart - Image 1](https://m.media-amazon.com/images/I/71pFEcmeYZL.jpg)

## Questions & Answers

**Q: What color is the fluid?**
A: The primary case fluid is amber colored.  You may be thinking about the Heavy Shockproof Transmission fluid which is pink.

**Q: Can this be used in a can am outlander atv?**
A: this is for a wet clutch where the transmission and primary do not share the same fluid

**Q: Any compatibility issues removing amsoil from primary and replacing with red line?**
A: Don't know I was running HD primary oil but I don't think there would be any issues it doesn't circulate through the engine or tranny.

**Q: What computer part on my Harley-Davidson can I put on and hook up to the computer to get in more rapid response from my throttle**
A: You need a tuner from Harley, or another maker,TTS3 , etc. and program to be able to talk to your CPU .
The connection is under my seat,it differs with year and model bike.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Top notch oil
*by F***1 on May 21, 2026*

Probably the best primary fluid around. Clutch engages smoothly, and really quiets the mechanical noise. A note of caution when ordering. As others have noted, ckeck the amount of oil your specific bike needs. Several reviewers have models requiring 38 ounces. I’ve attaced a pic from my owners manual on a 2024 Streetglide with a Gen 2 M8. 34 ounces if filling from dry, 30 ounces if a wet refill. I assume the Gen 1 M8’s are the same. Can’t remember what it was on a Twin Cam.

### ⭐⭐⭐⭐⭐ Redlind oils for the win !
*by J***M on July 22, 2026*

Ive tried different oils for my Harley in the past, but have long ago preferred Redline for all 3 holes.

### ⭐⭐⭐⭐⭐ Primary oil
*by S***N on June 24, 2026*

Fast shipping, good product!

## Frequently Bought Together

- Red Line 42904 V-Twin Primary Case Oil, for use with UTVs, ATVs and Sportbikes - 1 Quart
- Red Line 42804 V-Twin Transmission Oil with Shockproof - 4 Quarts
- K&N Motorcycle Oil Filter: High Performance, Premium, Designed to be used with Synthetic or Conventional Oils: Fits Select Harely Davidson Motorcycles, KN-171B

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*Product available on Desertcart France*
*Store origin: FR*
*Last updated: 2026-09-30*