Royal Purple Max-Cycle 10W-40 Synthetic Motorcycle Oil — 1 Quart (Case of 6), High-Performance, Wet-Clutch Compatible

Royal Purple Max-Cycle 10W-40 is a high-performance synthetic motorcycle oil engineered to protect stressed 4-cycle engines and wet-clutch transmissions while improving film strength and reducing wear.

Designed for riders who demand more from their machines, this 10W-40 formulation blends advanced synthetic base stocks with Royal Purple's Synerlec additive technology to deliver enhanced load-carrying capacity, shear stability, and oxidation resistance. It works in both air-cooled and liquid-cooled motorcycle engines, is compatible with wet-clutch systems, and meets or exceeds API and JASO warranty requirements. You can add it directly without flushing when switching from other mineral or synthetic oils.

How does Max-Cycle protect high-stress motorcycle engines?

Max-Cycle builds a stronger lubricating film than conventional oils, reducing metal-to-metal contact under heavy loads. Its Synerlec chemistry increases load-bearing capacity, which helps prevent piston scuffing and protects crankshafts and valve train components during hard use.

• Proprietary Synerlec additives for 3–4× greater load capacity.
• High film strength reduces wear on pistons and buckets.
• Improved shear stability maintains viscosity under stress.

Will this oil work with my wet-clutch transmission?

Yes — the formula is compatible with wet-clutch systems and is safe for combined engine/transmission applications. It maintains smooth clutch engagement while providing the anti-wear and anti-oxidation benefits needed for transmission gears and shafts.

• JASO-rated performance for motorcycle wet-clutch compatibility.
• Balanced friction properties to avoid clutch slippage or chatter.
• Protects transmission gears from wear and corrosion.

Can I mix this oil with other brands when changing fluids?

Max-Cycle is compatible with most mineral and synthetic motor oils, so you can switch without flushing in most cases. For best results, change to Max-Cycle at a regular service interval and monitor oil condition according to your manufacturer's recommendations.

• Compatible with current mineral and synthetic oils.
• No mandatory flush required when switching from other oils.
• Continue routine oil and filter changes per service schedule.

What performance benefits should I expect during operation?

Riders can expect cooler operation, reduced parasitic power loss, and superior protection against rust and corrosion. The oil's oxidation resistance helps preserve performance over longer drain intervals compared with many conventional oils.

• Lower operating temperatures and improved efficiency.
• Enhanced rust and corrosion protection for longer component life.
• Stable viscosity retention under high temperatures and shear.

Who is this for: Royal Purple Max-Cycle 10W-40 is aimed at motorcyclists, performance riders, and technicians seeking a robust, multi-purpose motorcycle lubricant. It suits owners of air-cooled and liquid-cooled 4-stroke bikes, especially those with wet-clutch transmissions or machines exposed to heavy loads and high temperatures. Choose this case of six 1-quart bottles if you perform frequent maintenance, support multiple motorcycles, or want a supply of a premium synthetic oil engineered to reduce wear and maintain consistent performance ride after ride.