---
product_id: 3747152
title: "Red Line 42904 V-Twin Primary Case Oil, for use with UTVs, ATVs and Sportbikes - 1 Quart"
brand: "red line"
price: "NT$2059"
currency: TWD
in_stock: true
reviews_count: 13
category: "Red Line"
url: https://www.desertcart.tw/products/3747152-red-line-42904-v-twin-primary-case-oil-for-use
store_origin: TW
region: Taiwan
---

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

**Brand:** red line
**Price:** NT$2059
**Availability:** ✅ In Stock

## Summary

> 🏍️ Elevate your ride with clutch-perfect power — don’t get left behind!

## Quick Answers

- **What is this?** Red Line 42904 V-Twin Primary Case Oil, for use with UTVs, ATVs and Sportbikes - 1 Quart by red line
- **How much does it cost?** NT$2059 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/products/3747152-red-line-42904-v-twin-primary-case-oil-for-use)

## 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

- • **Ready for the Ride:** 1 quart of premium oil designed to boost your powersports machine’s efficiency
- • **Extended Clutch Life:** Lowers wear and operating temperature for longer-lasting performance
- • **Proven Industry Leader:** Trusted since 1979 for unmatched performance and protection
- • **Versatile Compatibility:** Perfectly engineered for V-Twin motorcycles, ATVs, UTVs, and sportbikes
- • **Precision Friction Balance:** Optimized clutch grip for smooth, slip-free operation

## 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 similar aftermarket models. It enhances clutch operation by reducing slip, wear, and temperature, extending clutch life. Ideal for motorcycles, ATVs, and UTVs, this 1-quart oil delivers proven performance and protection trusted by riders since 1979.

## 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: Buy this you won’t regret it - Great stuff I always use Red Line products in my 08 Dyna lowrider.
Review: Good stuff - Great product that I've used for years

## 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 |
| Best Sellers Rank | #5,108 in Automotive ( See Top 100 in Automotive ) #98 in Motor Oils |
| Brand | Red Line |
| Customer Reviews | 4.8 4.8 out of 5 stars (2,693) |
| Date First Available | January 30, 2010 |
| Exterior | Painted |
| Flash Point | 232 Degrees Celsius |
| Global Trade Identification Number | 00083522429047 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 1.7 pounds |
| Item model number | 42904 |
| Manufacturer | Red Line |
| Manufacturer Part Number | 42904 |
| Model | 42904 |
| OEM Part Number | 42904 |
| Product Dimensions | 3.9 x 4.9 x 9 inches |
| Size | 1 Quart |
| UPC | 083522429047 |
| Vehicle Service Type | Car |
| Viscosity | 75W/80W/75W80 sae_grade |

## Product Details

- **Brand:** Red Line
- **Liquid Volume:** 32 Fluid Ounces
- **Package Information:** Bottle
- **Vehicle Service Type:** Car
- **Viscosity:** 75W/80W/75W80 sae_grade

## Images

![Red Line 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)
![Red Line 42904 V-Twin Primary Case Oil, for use with UTVs, ATVs and Sportbikes - 1 Quart - Image 2](https://m.media-amazon.com/images/I/81-Iifv8aEL.jpg)
![Red Line 42904 V-Twin Primary Case Oil, for use with UTVs, ATVs and Sportbikes - 1 Quart - Image 3](https://m.media-amazon.com/images/I/81q0E0vcWBL.jpg)
![Red Line 42904 V-Twin Primary Case Oil, for use with UTVs, ATVs and Sportbikes - 1 Quart - Image 4](https://m.media-amazon.com/images/I/81owXIUH2ML.jpg)
![Red Line 42904 V-Twin Primary Case Oil, for use with UTVs, ATVs and Sportbikes - 1 Quart - Image 5](https://m.media-amazon.com/images/I/81hy2+caM8L.jpg)

## Available Options

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

## 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

### ⭐⭐⭐⭐⭐ Buy this you won’t regret it
*by D***K on November 29, 2025*

Great stuff I always use Red Line products in my 08 Dyna lowrider.

### ⭐⭐⭐⭐⭐ Good stuff
*by W***M on November 26, 2025*

Great product that I've used for years

### ⭐⭐⭐⭐⭐ Slick!
*by S***C on March 2, 2026*

Its red. Its liquid. Its slippery. Bike is happy.

## 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 Taiwan*
*Store origin: TW*
*Last updated: 2026-03-14*