10 Best Motorcycle Oil 10w40 of October 2025

• Full synthetic formula helps maximize power and acceleration
• Formulated to provide outstanding wet clutch protection for maximum power transfer and smooth shifting
• Added protection against harmful deposits that can decrease engine performance
• Excellent wear and corrosion protection to help keep the engine performing its best

Valvoline

• 1 gallon, 10W40
• Genuine OEM Honda oil
• HONDA set the standard for motorcycle oil when it introduced GN4 way back in 1975

Honda

• Meets the following standards: API SL/SH/SG and JASO MA
• Recommended for all 4-stroke motorcycles with catalytic converters
• Ester technology improves engine response
• Proprietary extreme pressure formula to protect the gearbox
• Low sulfur and phosphorus formula for bikes fitted with catalytic converters

Motul

• Maxima's Premium4 is a superior product featuring advanced additive technology in the development of highly stable and long life multi-grade motorcycle specific oil
• By using an exclusive blend of petroleum base stocks and advanced anti-wear, anti-shear additives, this product assures viscosity stability for all air and water-cooled 4-cycle engines with integrated transmissions
• This formula also has extra anti-scuff additives to handle extreme loads and peak temperatures in high performance engines
• Formulated for Wet clutches, the all weather formula reduces friction and engine temperatures and makes for easier starts
• Crafted from a premium petroleum base, Premium4 is Turbo certified, exceeding all JASO-MA M/C 4T and API SG/CC Specs

Maxima

• For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual.

Mobil 1

• Formulated with Trizone technology to protect all 3 critical zones: engine, clutch and gearbox
• Race derived technology for maximum engine acceleration
• Extreme high temperature air-cooled performance and water-cooled engine performance
• Excellent shear stability to prevent viscosity breakdown
• Exceeds API SL and JASO MA-2

Castrol

• Yamalube OEM Factory 4 Stroke All Purpose Oil
• Performance-Blend is Suitable for use in Motorcycles, ATVs, Side-by-Side Vehicles, and Scooters
• Mineral Oil Provides Stable Clutch Performance and Strength to Protect the Engine from Wear and Tear
• Oil Meets or Exceeds the JASO MA Requirements
• Genuine OEM Yamaha Product

YamaLube All Purpose

• Part synthetic 4-stroke motorcycle oil protects your bikes engine against high temperature deposit and wear
• Formulated with Heat Protection Molecules to combat and minimize the formation of harmful high temperature combustion deposits
• Outstanding high temperature oil consumption and oxidation control
• Exceeds API SG, JASO MA2

Castrol

• Formulated with proprietary Synerlec additive chemisty providing 3X to 4X the load carrying capacity of other synthetic engine oils
• High film strength protects buckets, crankshafts and reduces piston scuffing
• Superior rust and corrosion protection
• Cooler operation and less parasitic power loss
• Meets the requirements of JASO MA2 for wet clutch compatibility
• Flash Point: 204.00 Degrees Celsius
• Fit Type: Vehicle Specific

Royal Purple

• PRO PLUS+ is designed to prolong engine and wet clutch life and offers excellent feel, smoother transmission shifting, easy starts, and improved fuel economy
• PRO PLUS+ is an ester fortified 100 percent full synthetic 4T engine oil
• PRO PLUS+ is formulated to exceed JASO MA requirements for 4-cycle engines with integrated wet clutches
• Balanced Anti-wear and Anti-scuff additive system minimizes engine deposits while protecting critical engine, transmission and clutch components
• All weather formula meets or exceeds JASO MA, API SL/SJ/SH/SG

Maxima