Quicksilver V-Twin Primary & Transmission Fluid 1 Quart — API GL-4, Shear-Stable for Wet Diaphragm Clutches

Quicksilver 8M0175742 is a shear-stable, API GL-4 rated 1-quart fluid formulated specifically for V-twin motorcycle primary chaincases and transmissions that use wet diaphragm spring clutches.

This high-performance oil is engineered to keep clutch engagement crisp, shift actions smooth, and internal components protected under high load. It’s supplied in a convenient 1-quart bottle and is compatible with a wide range of V-twin models when the service manual calls for primary or transmission fluid meeting API GL-4. Using the correct fluid helps maintain reliable operation and reduces wear on gears and chains without affecting manufacturer warranties.

How does this fluid improve clutch engagement and shifting?

The formula includes friction modifiers and viscosity control agents tuned for wet diaphragm spring clutches, which helps produce consistent engagement feel and predictable shifting. It minimizes clutch slippage while allowing smooth transitions between gears, even under heavier loads or when the engine is hot.

• Friction characteristics matched to V-twin wet clutches for repeatable engagement.
• Viscosity stability under heat for steady shift performance.
• Reduces chatter and helps avoid abrupt gear changes.

Will this fluid protect gears, bearings and the primary chain?

Yes; the product contains anti-wear additives and is designed to be shear-stable so it maintains film strength under pressure. That combination helps reduce metal-to-metal contact, limits pitting and scuffing, and extends chain and gear life when used as specified.

• Anti-wear chemistry to reduce gear tooth and bearing wear.
• Shear stability to maintain protective viscosity in severe duty.
• Formulated to extend primary chain life by keeping lubrication consistent.

Is this safe for my bike’s warranty and which machines should use it?

Quicksilver specifies that this fluid meets or exceeds many manufacturers’ requirements and using it will not void warranties when an appropriate specification is followed. Always confirm your owner’s or service manual for the correct fluid type and capacity for your specific V-twin model.

• Meets API GL-4 performance level commonly required for V-twin primaries.
• Intended for motorcycles with wet diaphragm spring clutches and dedicated primary/transmission reservoirs.
• Follow OEM service instructions for change intervals and fill volumes.

How do I use this 1-quart bottle during maintenance?

The 1-quart bottle provides enough oil for many primary fill requirements or partial top-offs. For best results, perform a complete drain and refill according to the service manual, and inspect seals and fasteners while the system is open.

• Drain old fluid at the recommended service interval, then refill to the correct level.
• Use a clean funnel and avoid cross-contamination with other lubricants.
• Dispose of used oil per local environmental regulations.

Who is this for: Riders and technicians who maintain V-twin motorcycles with wet diaphragm spring clutches and need a purpose-built primary/transmission fluid. It’s suitable for owners who want a shear-stable, API GL-4 rated lubricant to support consistent clutch feel, reliable shifting and long component life. Check your machine’s manual to confirm compatibility, fluid capacity and recommended service intervals before use.