10W-40 Synthetic Dirt Bike Oil
Key Benefits
🏍️ Exceptional Clutch Feel and Performance
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Specially engineered to maintain superior friction durability, helping to:
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Prevent clutch slippage
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Reduce clutch wear
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Eliminate chatter or vibration
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Provides consistent clutch feel for dirt bike riders in competitive racing or off-road riding, boosting rider confidence under demanding conditions.
🧪 Clutch Feel Testing:
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A simulated race-start test showed that:
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After 32 laps, AMSOIL 10W-40 still delivered excellent clutch feel.
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The clutch plates remained clean and in good condition.
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In contrast, OEM-filled engine oils degraded clutch feel significantly after only 16 laps, with clutch plates showing discoloration and noticeable wear (as illustrated in test images).
⚙️ Superior Wear Protection
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Formulated for high-RPM dirt bike engines which generate intense heat and shear forces.
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Uses a fully synthetic base oil combined with proprietary anti-wear additives developed by AMSOIL.
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Forms a durable protective film on components such as:
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Gears
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Pistons
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Bearings
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Helps maximize engine performance and longevity.
🏁 Proven in Professional Racing
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AMSOIL 10W-40 Dirt Bike oil has been tested and validated in real-world conditions and professional competitions.
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Feedback from pro racers and data from both field tests and lab testing were used to fine-tune the formulation.
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The goal: optimal clutch control, engine protection, and durability for high-performance dirt biking.
🔧 Recommended Applications
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Suitable for 4-stroke dirt bikes that require SAE 10W-40, including:
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Honda®, Yamaha®, Kawasaki®, Suzuki®, Husqvarna®, etc.
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Also compatible with 2-stroke bikes with separate engine and transmission systems (e.g., Honda CRF).
🏷️ Meets or Exceeds the Following Standards:
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JASO MA (wet clutch compatibility)
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API SG, SJ, SH, SL
🔄 Oil Change Interval
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Follow the OEM recommendation as specified in the owner’s manual for your dirt bike.
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Designed to withstand demanding conditions, but change interval depends on how the bike is used (e.g., competition, trail riding, etc.).
TYPICAL TECHNICAL PROPERTIES | |
AMSOIL 10W-40 Synthetic Dirt Bike (DB40) | |
Kinematic Viscosity @ 100°C, cSt (ASTM D445) | 14.2 |
Kinematic Viscosity @ 40°C, cSt (ASTM D445) | 93.5 |
Viscosity Index (ASTM D2270) | 156 |
Flash Point, °C (°F) (ASTM D92) | 246 (475) |
Fire Point, ºC (ºF) (ASTM D92) | 254 (489) |
Pour Point, °C (°F) (ASTM D97) | -44 (-47) |
NOACK Volatility, % weight loss (g/100g) (ASTM D5800) | 4.0 |
High-Temperature/High-Shear Viscosity @150ºC, 1.4 x 106 s-1, cP (ASTM D5481) | 4.1 |
Four-Ball Wear Test (ASTM D4192 @ 40 kgf, 150°C, 1800 rpm, 1 hr) scar, mm | 0.39 |
Foam (ASTM D5182, Sequence I, II & III) | 0/0, 20/0, 0/0 |
Total Base Number | 6.62 |