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Motul Transoil Expert 10W40 is a high-performance semi-synthetic transmission lubricant engineered for separate gearbox systems using wet clutches — the setup found in most high-output shifter karts and competition motorcycles. Its ester-based formula delivers superior lubrication film strength, reduced clutch fade, and smooth, positive gear shifting under the harshest racing conditions.
Technical Highlights:
• SAE 10W40 viscosity grade – ideal for protection and performance at elevated temperatures.
• Viscosity @ 40 °C: ~95 mm²/s Viscosity @ 100 °C: ~14 mm²/s Viscosity Index: 150 +
• Density @ 20 °C: ~0.87 g/cm³ Flash Point: > 230 °C Pour Point: ~-30 °C
• Semi-synthetic (Ester-based) formula – higher film strength and oxidation resistance vs mineral oil.
• Contains anti-wear and extreme-pressure (EP) additives for sustained gear protection.
• Designed to improve clutch performance and prevent slippage during racing launches.
• Resists shear degradation for consistent viscosity over multiple race cycles.Recommended For:
• High-horsepower shifter karts (KZ, ICC, CR125, TM K9, Vortex Rok Shifter, etc.).
• 2-stroke and 4-stroke motorcycle gearboxes using wet clutch systems.
• Applications where engine and gearbox oils are separate and SAE 10W40 is specified.Benefits:
• Provides smoother shifting and reduced clutch chatter.
• Prevents power loss from clutch slip under high torque.
• Delivers excellent gear protection in both sprint and endurance racing.
• Maintains stability and performance across heat cycles and extreme loads.
