--- product_id: 256579733 title: "Red Line 42904 V-Twin Primary Oil, 1 Quart, 1 Pack" brand: "red line" price: "VT18670" currency: VUV in_stock: true reviews_count: 5 category: "Red Line" url: https://www.desertcart.vu/products/256579733-red-line-42904-v-twin-primary-oil-1-quart-1 store_origin: VU region: Vanuatu --- # Reduces clutch temperature Friction-balanced formula Optimized for V-Twin engines Red Line 42904 V-Twin Primary Oil, 1 Quart, 1 Pack **Brand:** red line **Price:** VT18670 **Availability:** ✅ In Stock ## Summary > 🏍️ Ride smoother, last longer — clutch oil that keeps you ahead of the pack! ## Quick Answers - **What is this?** Red Line 42904 V-Twin Primary Oil, 1 Quart, 1 Pack by red line - **How much does it cost?** VT18670 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/256579733-red-line-42904-v-twin-primary-oil-1-quart-1) ## 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 - • **Trusted Legacy:** From Red Line, a brand synonymous with uncompromising quality since 1979. - • **Performance Boost:** Enhances clutch feel and power delivery, ideal for modified and stock bikes alike. - • **Wide Compatibility:** Perfect fit for 1984-to-present V-Twin American motorcycles and aftermarket engines. - • **Extended Clutch Lifespan:** Reduces wear and heat, keeping your clutch performing longer under pressure. - • **Precision Friction Balance:** Engineered to limit clutch slip for smoother, more responsive operation. ## Overview Red Line 42904 V-Twin Primary Oil is a friction-balanced synthetic oil designed specifically for 1984-to-present V-Twin American motorcycle engines. It improves clutch operation by reducing slip, wear, and temperature, extending clutch life and enhancing performance in motorcycles, ATVs, and powersports vehicles with wet-diaphragm spring clutches. ## Description Red Line's V-twin primary case oil is designed specifically for 1984-to-present V-Twin American motorcycle engines, including aftermarket engines of similar designs. Similar to Red Line MTL, this product is for use in the primary chain case with wet-diaphragm spring clutches. Designed to operate over a wide temperature range, V-twin primary case oil improves clutch operation, while reducing wear and temperature. Where most synthetics are too slippery for clutch operation, this friction-balanced product is designed to provide less slip, smoother operation, and more power in modified engines Review: Works well Review: Redline oil ## 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 | Universal Fit | | Best Sellers Rank | #40,321 in Automotive ( See Top 100 in Automotive ) #485 in Automotive Oils | | Brand | Red Line | | Brand Name | Red Line | | Compatible with Vehicle Type | Motorcycle, ATV, UTV | | Container Type | Bottle | | Customer Reviews | 4.8 out of 5 stars 2,601 Reviews | | Flash Point | 232 Degrees Celsius | | Flash point | 232 Degrees Celsius | | 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 | | Liquid volume | 32 Fluid Ounces | | Manufacturer | Red Line | | Manufacturer Part Number | 42904 | | Model Number | 42904 | | Package information | Bottle | | Part Interchange Info | 42904 | | SAE J300 Viscosity Grade | 10W-40 | | Size | 1 Quart | | UPC | 083522429047 | | Unit Count | 32 Milliliters | | Vehicle service type | Motorcycle, ATV, UTV | ## Product Details - **Brand:** Red Line - **Liquid volume:** 32 Fluid Ounces - **Package information:** Bottle - **Vehicle service type:** Motorcycle, ATV, UTV - **Viscosity:** 10W 40 ## Images ![Red Line 42904 V-Twin Primary Oil, 1 Quart, 1 Pack - Image 1](https://m.media-amazon.com/images/I/71pFEcmeYZL.jpg) ![Red Line 42904 V-Twin Primary Oil, 1 Quart, 1 Pack - Image 2](https://m.media-amazon.com/images/I/81-Iifv8aEL.jpg) ![Red Line 42904 V-Twin Primary Oil, 1 Quart, 1 Pack - Image 3](https://m.media-amazon.com/images/I/81q0E0vcWBL.jpg) ![Red Line 42904 V-Twin Primary Oil, 1 Quart, 1 Pack - Image 4](https://m.media-amazon.com/images/I/81owXIUH2ML.jpg) ![Red Line 42904 V-Twin Primary Oil, 1 Quart, 1 Pack - Image 5](https://m.media-amazon.com/images/I/81hy2+caM8L.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 ### ⭐⭐⭐⭐ Works well *by B***N on 11 November 2019* ### ⭐⭐⭐⭐⭐ Redline oil *by B***G on 8 February 2025* ### ⭐⭐⭐⭐⭐ The best *by R***P on 14 April 2026* ## 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 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.vu/products/256579733-red-line-42904-v-twin-primary-oil-1-quart-1](https://www.desertcart.vu/products/256579733-red-line-42904-v-twin-primary-oil-1-quart-1) --- *Product available on Desertcart Vanuatu* *Store origin: VU* *Last updated: 2026-05-09*