Red Line Primary Case Oil 1 Quart - Harley Evolution & Twin Cam Wet Clutch
About Red Line
Red Line parts and accessories are stocked at Vtwinbikers for Harley-Davidson and Indian Motorcycle applications. Every Red Line item we list is new and sourced through authorized distribution. If you are not certain a part matches your year and model, use Shop by Bike or email our team before you order and we will confirm fitment first.
Red Line Primary Case Oil is a full-synthetic fluid formulated for V-twin motorcycle primary chaincases equipped with wet-diaphragm spring clutches. This advanced oil is engineered to achieve optimal friction balance, ensuring smooth clutch operation and efficient power transfer. It also significantly reduces wear across Evolution, Twin Cam, and compatible aftermarket engines.
Why riders pick this
- Friction-balanced for smooth wet-clutch operation
- Reduces clutch slip and improves power transfer
- Lowers primary case operating temperature
- Compatible with Evolution and Twin Cam engines
- Synthetic formula for superior wear protection
Enhance the performance and longevity of your Harley-Davidson or Indian Motorcycle's primary drive with Red Line Primary Case Oil. This synthetic fluid is specifically designed for V-twin primary chaincases featuring wet-diaphragm spring clutches. Its unique formulation provides the ideal balance of friction to prevent clutch slip while ensuring precise engagement, leading to a more consistent and enjoyable ride.
Optimized Primary Drive Performance
- Friction-balanced synthetic formulation for smooth clutch engagement
- Reduces clutch slip for improved power transfer
- Lowers operating temperature within the primary case
- Compatible with wet-diaphragm spring clutches
- Works in Evolution, Twin Cam, and similar V-twin designs
Protection for Your Drivetrain
Red Line Primary Case Oil goes beyond basic lubrication by actively protecting your primary chain and clutch components. By lowering operating temperatures and providing superior wear protection, it helps extend the life of critical drivetrain parts. This is the ideal choice for riders who demand reliable clutch performance and robust protection for their Evolution or Twin Cam-powered V-twin.
Specifications
- Brand: Red Line
- Manufacturer Part #: 42904
- UPC: 083522429047
- Volume: 1 quart
- Weight: 2.01 lbs
- Dimensions: 4 in W × 4 in L × 8.8 in H
Common questions
Is Red Line Primary Case Oil suitable for dry-clutch primaries?
No, this oil is specifically formulated for wet-diaphragm spring clutches only. Dry-clutch primary systems require a different type of lubricant.
Will this oil improve my clutch's performance?
Yes, its friction-balanced synthetic formulation is designed to reduce clutch slip and provide smoother, more consistent clutch engagement, improving power transfer.
Is this product compatible with older Harley-Davidson models?
Yes, this primary case oil is compatible with 1984-present V-twin American motorcycles, including Harley-Davidson Evolution and Twin Cam engines, and Indian Motorcycle models with wet-diaphragm spring primary clutches.
Ordering from Vtwinbikers
- Brand new, sourced through authorized US distribution — never used, never grey-market.
- Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
- Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
| BRAND | Red Line |
| TYPE | Chemicals |
| SKU | 57-6522 |
| WEIGHT | 2.01 lb |
