--- product_id: 58725086 title: "(42904) V-Twin Primary Case Oil - Engine Oil (1 Quart Bottle)" brand: "red line" price: "583.79 DT" currency: TND in_stock: true reviews_count: 5 url: https://www.desertcart.tn/products/58725086-42904-v-twin-primary-case-oil-engine-oil-1-quart store_origin: TN region: Tunisia --- # Wide temperature range (up to 232°C flash point) Friction-balanced formula Specifically for 1984+ V-Twin motorcycles (42904) V-Twin Primary Case Oil - Engine Oil (1 Quart Bottle) **Brand:** red line **Price:** 583.79 DT **Availability:** ✅ In Stock ## Summary > 🏍️ Elevate your ride with clutch-perfect power — don’t let your V-Twin settle for less! ## Quick Answers - **What is this?** (42904) V-Twin Primary Case Oil - Engine Oil (1 Quart Bottle) by red line - **How much does it cost?** 583.79 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/58725086-42904-v-twin-primary-case-oil-engine-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 - • **Tailored for V-Twins:** Engineered exclusively for 1984-to-present American V-Twin engines and compatible aftermarket models. - • **Race-Proven Reliability:** Developed by Red Line, a leader since 1979 in high-performance lubricants trusted by racers and enthusiasts alike. - • **Precision Clutch Control:** Friction-balanced synthetic oil ensures smooth, slip-free clutch engagement for peak performance. - • **Enhanced Engine Longevity:** Reduces wear and mechanical noise, extending the life of your primary chain and clutch components. - • **Extreme Temperature Resilience:** Operates flawlessly from cold starts to high-heat rides with a 232°C flash point. ## Overview Red Line's V-Twin Primary Case Oil is a full-synthetic, friction-balanced lubricant designed specifically for 1984 and newer American V-Twin motorcycle engines. It optimizes clutch operation by reducing slip and wear, performs reliably across a wide temperature range with a 232°C flash point, and is trusted by racers since 1979. Ideal for wet-diaphragm spring clutches, this oil enhances power delivery and quiets mechanical noise, making it the go-to choice for serious riders seeking peak performance and engine longevity. ## Description Everyone thinks about the transmission side, but the clutch and primary chain need love, too. POWERSPORTS GEAR OIL Full-synthetic formulations specific to the latest V-Twins, UTVs, ATVs and Sportbikes 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 chaincase 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. SINCE 1979 In 1979, Red Line Synthetic Oil began creating lubricants for the racing industry. Today, we manufacture more than 100 quality products, including motor oils, gear oils, assembly lubes, fuel additives and our popular WaterWetter cooling additive for the automotive, motorcycle, marine and industrial markets. TECHNOLOGY Using cutting edge technology, Red Line responds to the technical challenges of today's performance industry. We are enthusiasts that stay on top of each market niche, ensuring product recommendations that result in serious performance gains. We use this knowledge of racing to create high-performance products for track cars and street vehicles. Red Line products perform and protect better than any on the market. No compromises. Everyone thinks about the transmission side, but the clutch and primary chain need love, too. POWERSPORTS GEAR OIL Full-synthetic formulations specific to the latest V-Twins, UTVs, ATVs and Sportbikes 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 chaincase 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. SINCE 1979 In 1979, Red Line Synthetic Oil began creating lubricants for the racing industry. Today, we manufacture more than 100 quality products, including motor oils, gear oils, assembly lubes, fuel additives and our popular WaterWetter cooling additive for the automotive, motorcycle, marine and industrial markets. TECHNOLOGY Using cutting edge technology, Red Line responds to the technical challenges of today's performance industry. We are enthusiasts that stay on top of each market niche, ensuring product recommendations that result in serious performance gains. We use this knowledge of racing to create high-performance products for track cars and street vehicles. Red Line products perform and protect better than any on the market. No compromises. 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: Works well - For 2011 FLHRC. Has made neutral easier to find. ## Features - For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0053O9EUA | | Automotive Fit Type | Universal Fit | | Best Sellers Rank | 249,143 in Automotive ( See Top 100 in Automotive ) 1,682 in Car Engine Oils | | Brand | Red Line | | Brand Name | Red Line | | Compatible with Vehicle Type | Motorcycle | | Container Type | Bottle | | Customer Reviews | 4.8 out of 5 stars 2,480 Reviews | | Flash Point | 232 Degrees Celsius | | Flash point | 232 Degrees Celsius | | Global Trade Identification Number | 00083522429047 | | Included Components | Red Line (42904) V-Twin Primary Case Oil - Engine Oil (1 Quart Bottle) | | 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 | | Size | 1 Quart | | UPC | 083522429047 | | Unit Count | 946.3529 millilitre | | Vehicle service type | Motorcycle | ## Product Details - **Brand:** Red Line - **Liquid volume:** 32 Fluid Ounces - **Package information:** Bottle - **Vehicle service type:** Motorcycle - **Viscosity:** 75W/80W/75W80 sae_grade ## Images ![(42904) V-Twin Primary Case Oil - Engine Oil (1 Quart Bottle) - 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 21 May 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. ### ⭐⭐⭐⭐ Works well *by B***N on 11 November 2019* For 2011 FLHRC. Has made neutral easier to find. ### ⭐⭐⭐⭐⭐ Best oil *by J***J on 14 September 2025* Best oil for Harley ## 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.tn/products/58725086-42904-v-twin-primary-case-oil-engine-oil-1-quart](https://www.desertcart.tn/products/58725086-42904-v-twin-primary-case-oil-engine-oil-1-quart) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-07-18*