Liqui Moly 4T 10W-40 Street motorcycle oil, 4 L — fully synthetic, wet-clutch compatible

This 4-liter container of Liqui Moly 4T 10W-40 Street is engineered for modern air- and water-cooled 4-stroke motorcycle engines. The fully synthetic base and tailored additive package provide stable viscosity across temperature ranges, reduce wear, and help maintain engine cleanliness under both normal commuting and demanding riding conditions. It is compatible with wet-clutch systems and supports consistent friction behavior for predictable clutch engagement and gear changes.

How does this oil protect my motorcycle’s engine under varied conditions?

The synthetic formulation resists thermal breakdown and holds a stable oil film at higher temperatures, cutting metal-to-metal contact and minimizing wear. Liqui Moly's additive system also helps prevent deposit formation so moving parts remain cleaner and operate more efficiently.

• Stable viscosity control from cold start to high heat
• Friction-optimized additives reduce clutch slip and wear
• Deposit inhibitors keep combustion chambers and piston rings cleaner
• Protects bearings and cams during extended high-load use

Will it work with my wet-clutch motorcycle and gearbox?

Yes — this oil is formulated for engines with wet clutches and delivers predictable friction characteristics so the clutch engages smoothly without slippage. It also provides reliable lubrication for gear teeth and synchromesh components, supporting crisp shifting in street riding scenarios.

• Compatible with wet-clutch systems for consistent engagement
• Friction modifiers tuned to avoid clutch drag or slip
• Protects gearbox components from wear and scoring
• Supports smooth shifts under stop-and-go and spirited riding

What maintenance benefits and cleaning performance can I expect?

Liqui Moly 4T 10W-40 uses detergents and dispersants to limit sludge and varnish formation, promoting cleaner oil galleries and longer component life. Cleaner internals contribute to stable performance and can help preserve compression and fuel efficiency over time.

• Reduces sludge and varnish buildup in the engine
• Helps maintain piston ring mobility and sealing
• Extends service intervals when used as recommended
• Improves cold-start lubrication for faster protection

How should I choose this grade for my motorcycle compared to other oils?

10W-40 is a versatile grade that balances cold-start flow and high-temperature film strength, making it suitable for many street motorcycles operating across seasons. Check your owner’s manual for recommended viscosities and approvals; this product fits most modern 4-stroke bikes requiring a synthetic 10W-40 oil.

• 10W rating eases cold starting and pumpability
• 40 high-temperature rating preserves oil film under load
• Intended for both air- and water-cooled engines
• Suitable where manufacturers call for synthetic 10W-40 oils

Who is this for? Riders seeking a reliable, fully synthetic 10W-40 engine oil for street motorcycles will find Liqui Moly 4T 10W-40 Street ideal. It suits commuters, sport-touring riders and anyone with a 4-stroke bike that uses a wet or dry clutch and needs a product that prioritizes engine cleanliness, consistent clutch feel, and wear protection across everyday and demanding riding conditions. Always follow your motorcycle manufacturer’s specifications when selecting oil and observe recommended change intervals.