Designed to improve the performance of bike and rider.
Engineered to deliver the performance attributes most requested by on - and off-track dirt bike riders, including consistent clutch feel. Consistent clutch feel is the result of 'friction durability', so whether deep into a race or deep in the woods, riders can feel confident that their clutch will perform from start to finish. AMSOIL exclusive advanced chemistry provides outstanding engine reliability for worry-free operation under severe
conditions.
Package sizes include:
1-Quart Bottle
1-Quart Bottles (case of 12)
10W-40 Synthetic Dirt Bike Oil: recommended for Honda®, Yamaha®, Kawasaki®, Suzuki®, Husqvarna® and other dirt bikes where 10W-40 motorcycle oil is used. Recommended for separate-sump applications such as Honda CRF, and many two-stroke dirt bikes.
Product Application Specs
AMSOIL INC., the premier manufacturer of synthetic motorcycle lubricants, focuses on improving lubricant performance so riders can focus on improving their performance on the trail or the track. That's why AMSOIL is the Official Oil of Monster Energy Supercross, AMSOIL Arenacross, AMSOIL GNCC and the AMA Amateur Nationals.
AMSOIL Synthetic Dirt Bike Oil's superior friction-durability properties help minimize clutch slippage, fade and chatter, giving riders consistent clutch feel during takeoffs or when maneuvering around obstacles on the trail. In an extreme simulated-start test, AMSOIL Synthetic Dirt Bike Oil continued to deliver consistent clutch feel following 32 simulated race starts, while a leading original equipment manufacturer (OEM)-branded oil demonstrated
inconsistent clutch-lever action and poor clutch feel after 16 starts.
The clutch plates lubricated with AMSOIL Synthetic Dirt Bike Oil remained clean and in good overall condition, while the plates using the OEM oil revealed discoloration and wear. AMSOIL Synthetic Dirt Bike Oil's superior performance helps instill in riders the confidence that their bikes will perform consistently in all types of riding conditions.
AMSOIL Synthetic Dirt Bike Oil withstands high-rpm operation, extreme heat and mechanical shear. Its synthetic base oils naturally resist viscosity loss and provide a protective film against wear to gears, bearings and pistons. Its anti-wear additives provide an extra measure of protection, promoting long component life to help riders get the most out of their bikes.
• Delivers confidence in clutch feel
• Superior protection against gear, bearing & piston wear
• Maximizes horsepower
• Helps extend
clutch life
AMSOIL Synthetic Dirt Bike Oil underwent extensive on-track testing in the bikes of AMSOIL-sponsored professional riders on the GEICO/AMSOIL/Honda Factory Connection and Team Babbitt's racing teams. A combination of racer feedback and lab testing allowed AMSOIL to fine-tune AMSOIL Synthetic Dirt Bike Oil for outstanding wear protection and consistent clutch feel - benefits riders demand.
AMSOIL Synthetic Dirt Bike Oil should be changed according to the vehicle manufacturer's recommendations.
This product is not expected to cause health concerns when used for the intended application and according to the recommendations in the Material Safety Data Sheet (MSDS).
Click here to view the MSDS Data Sheet for AMSOIL DB40.
Keep out of the reach of children. Don't pollute. Return used oil to collection centers.
| TYPICAL TECHNICAL PROPERTIES | |
| SAE 10W-40 Dirt Bike Oil (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) |
| Flash Point °C (°F) (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 @ 150°C , 1.0x 106 s-1), cP (ASTM D5481) | 4.1 |
| Four Ball Wear Test (ASTM D4192 @ 40 kgf, 150°C, 1800 rpm, 1 hour),Scar, mm | 0.39 |
| Foam (ASTM D892, Sequence I, II & III) | 0/0, 20/0, 0/0 |
| Total Base Number | 6.62 |
Also use AMSOIL Gasoline Stabilizer, in addition to fresh Oil & Filter
Product Name: Dirt Bike Motor Oils
Current Rating: 5out of 5 stars
Votes & Reviews: 56 vote(s) and 61 user reviews.
Reviewed by Moto Mike: 
I like the performance of this product in my YZ450F. Clutch feels great, motor runs smooth, and with the preferred customer pricing it's the same or better pricing than anything else.
Reviewed by Robert:
Been using Amsiol in my racing motorcycles for more than 25 years and love the performance and wear protection it gives.
Reviewed by Jim:
The only oil I use in my bike.
Reviewed by Cliff:
Amazing product
Reviewed by Willie:
I have this in 3 dirt bikes and so far I have no sticking clutch or anything. So I'm convinced it does it's job!
Reviewed by Bart:
My regional dealer I get amsoil through is without a doubt the best freaking guy ever! Always resolves any issue I've had imeaditely
Reviewed by Bob:
I started to run this oil on my adventure bikes. Needless to say that it does exactly what Amsoil says it does. Best clutch pull and feel, even after several slipper clutching maneuvers in difficult trails.
Reviewed by Matt:
Put this oil in my CR 85. Clutch feel is better and gear changes are smoother.
Reviewed by Rpm:
Can't buy better
Canada
United States
I would buy this again
I race dirt bikes and have found this oil to stay cleaner than others after 10 hard racing hours.