Maximize Clutch Power: Red Line V-Twin Primary Case Oil

Ensure smooth, positive clutch engagement and extend the life of your primary chain with Red Line V-Twin Primary Case Oil (Part #42904), available now at Straight Six Imports. This full-synthetic, friction-balanced GL-4 fluid is engineered specifically for the demanding environment of American V-Twin primary chaincases (Harley-Davidson Evolution, Twin Cam, Milwaukee-Eight).

Derived from Red Line's famous MTL gear oil, this fluid features a specialized friction package that is precisely balanced—it’s slippery enough to reduce wear on the primary chain and sprockets, yet it avoids the excessive slipperiness of standard engine oils that can cause wet clutch slip.

Key Features for V-Twin Drivetrains:

• Friction-Balanced Formula: Designed for wet-diaphragm spring clutches, this unique formulation improves clutch operation, reduces slip, and helps transmit more power, especially in modified engines.

• Reduces Wear and Temperature: Provides superior anti-wear protection for the primary chain and components, helping to lower operating temperatures under heavy load.

• GL-4 Protection: Classified as a GL-4 75W80 gear oil (equivalent to a 5W30 motor oil viscosity), offering excellent protection against high-pressure wear.

• High-Temperature Stability: The ester base stocks provide exceptional shear and thermal stability, maintaining viscosity integrity even in hot, air-cooled applications.

• Compatibility: Ideal for 1984-to-present V-Twin engines and suitable for the primary case in older British motorcycles.

Don't compromise on your V-Twin's power transfer. Choose the dedicated protection of Red Line V-Twin Primary Case Oil (42904).