Motul Transoil Expert 10W-40 – Premium Transmission Oil for High-Performance Motorcycles and Karts

Purpose and Specifications

Motul Transoil Expert 10W-40 is a semi-synthetic transmission oil engineered for motorcycles, shifter karts, quads, and mopeds with separate gearbox systems and wet clutches. This oil is designed to handle extreme racing conditions, high temperatures, and intense mechanical stress while keeping your transmission smooth and responsive.

What Makes This Oil Different:

• Semi-synthetic ester-based formula provides superior film strength compared to mineral oils, protecting gears under extreme pressure
• Stays fluid at cold temperatures (flows easily at -30°C) while maintaining thickness at high heat (SAE 40 rating ensures protection at elevated temperatures)
• Reduces clutch fade and prevents clutch slip during hard acceleration and racing launches
• Resists breakdown over multiple heat cycles, maintaining consistent performance throughout the racing season
• Keeps gears and clutch discs clean with dispersant additives that prevent sludge buildup
• Prevents corrosion, wear, and foaming in high-pressure conditions

When to Use / Replace?

Use Motul Transoil Expert 10W-40 in any 2-stroke or 4-stroke motorcycle, kart, quad, or moped where the manufacturer specifies SAE 10W-40 transmission oil or SAE 80 gearbox oil. This oil is ideal for road riding, trail riding, cross-country, enduro, and racing applications.

Replacement Schedule: For racing and extreme conditions, change the oil every 500–1,000 km or at the start of each racing season. For regular road use, follow your manufacturer's maintenance schedule (typically every 3,000–5,000 km or annually). Always check your owner's manual for specific recommendations.

Operating Temperature Range: This oil performs reliably from -30°C (cold starts) to over 230°C (flash point), making it suitable for both winter riding and high-temperature racing environments.

Storage: Store in a cool, dry place. Unopened bottles maintain quality for several years when stored properly.

Frequently Asked Questions

Q: Can I use this oil in my street bike or is it only for racing?
A: Motul Transoil Expert works in both street and racing applications. It's designed for any motorcycle, kart, or quad with a separate gearbox and wet clutch system. If your manufacturer recommends SAE 10W-40 transmission oil, this product is suitable.

Q: Will this oil reduce clutch slip and improve shifting?
A: Yes. The ester-based formula and anti-wear additives improve clutch engagement and prevent slippage under high torque. You'll notice smoother, faster gear changes and better control during hard acceleration.

Q: How do I know if my bike needs a separate transmission oil?
A: Check your owner's manual. If it specifies a separate gearbox oil (not engine oil), your bike has a wet clutch system. Motul Transoil Expert is designed for exactly this setup. Most 2-stroke motorcycles and high-performance karts use separate transmission oil.