Skip to Main Content
Close Icon

Main Menu

Begin typing to search, use arrow keys to navigate, Enter to select.
Roll over image to zoom in

10W-40 Synthetic Dirt Bike Oil

Product code : DB40QT-EA

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 their clutch will perform from start to finish. AMSOIL-exclusive advanced chemistry provides outstanding engine reliability for worry-free operation under severe conditions.
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 their clutch will perform from start to finish. AMSOIL-exclusive advanced chemistry provides outstanding engine reliability for worry-free operation under severe conditions.

10W-40 Synthetic Dirt Bike Oil



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 track. That's why AMSOIL is the choice of professional riders and weekend warriors everywhere.

Delivers Confidence in Clutch Feel
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.

Protects Against Wear
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

Rings

RACING IS RESEARCH
AMSOIL Synthetic Dirt Bike Oil underwent extensive on-track testing in the bikes of professional riders. 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.

APPLICATIONS
Use 10W-40 Synthetic Dirt Bike Oil in dirt bikes that require 10W-40 motorcycle oil, including those made by Honda*, Yamaha*, Kawasaki*, Suzuki* and Husqvarna. Recommended for separate-sump applications, including the Honda CRF, and many two-stroke dirt bikes. JASO MA; API SG, SJ, SH, SL.

*All trademarked names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use. All products advertised here are developed by AMSOIL for use in the applications shown.

SERVICE LIFE
AMSOIL Synthetic Dirt Bike Oil should be changed according to the vehicle manufacturer's recommendations.

COMPATIBILITY
AMSOIL Synthetic Dirt Bike Oil is compatible with other synthetic and conventional motor oils. Adding other oils, however, will shorten the life expectancy of AMSOIL motor oils and reduce their performance benefits. AMSOIL does not support extended drain intervals where oils have been mixed. Aftermarket oil additives are not recommended for use with AMSOIL Synthetic Dirt Bike Oil.

WARRANTY SECURE
AMSOIL Synthetic Dirt Bike Oil is Warranty Secure, keeping your factory warranty intact. AMSOIL Synthetic Dirt Bike Oil is a high-performance replacement for vehicle manufacturer-branded products and is also backed by the AMSOIL Limited Warranty. For details, visit www.amsoil.com/warranty/.

Warranty Secure

HEALTH & SAFETY
This product is not expected to cause health concerns when used for the intended applications and according to the recommendations in the Safety Data Sheet (SDS). An SDS is available via the Internet at www.amsoil.com or upon request at (715) 392-7101. Keep Out of Reach of Children. Recycle used oil and bottle.

10W-40 Synthetic Dirt Bike Oil



10W-40 Synthetic Dirt Bike Oil

  • 5 star rating
    Awesome product
    By  PHILLIP,  a  Verified Buyer  on  September 16, 2022
    awesome product
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Air cooled Honda XR400R, 25 years old, runs like new
    By  MXrider,  a  Verified Buyer  from  Tucson AZ  on  August 02, 2022
    I've been running AMSOIL in my XR400R for 25 years and just checked the compression, 11 PSI off factory spec. It runs in the Arizona desert and engine temp is normally high (220), its an air-cooled bike and heat dissipation is everything.. I think AMSOIL adds Unicorn pee or something magic, that's the only way this is possible...
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Made my engine so smooth and quiet
    By  STEVEN,  a  Verified Buyer  from  Nj   on  June 20, 2022
    Bought a 2011 Husqvarna sms630 recently and thought I’d need a new cam chain tensioner until I tried using this oil For the first time as I’ve always had good luck with Amsoil products. This oil made my engine run super quiet and so smooth! And even after breaking in a new clutch this oil turned black and was still super clingy and slick feeling. Highly recommend this for your dirt bike!!
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Great bike oil
    By  AUGUST,  a  Verified Buyer  from  Tofte Minnesota  on  June 07, 2022
    Great dirt bike oil
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Happy with the products
    By  CORY,  a  Verified Buyer  on  May 21, 2022
    Dumping this oil in our race bikes. Seems great so far
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Happy with the products
    By  CORY,  a  Verified Buyer  on  May 21, 2022
    Been using this oil in our race bike. Change it every 5 hrs , working great so far.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Bike oil
    By  GEORGE,  a  Verified Buyer  on  May 19, 2022
    Have never had a bearing failure are a clutch failure using Amsoil. I have both 2 stroke and 4 stroke bikes. I recommend it to other people that I race with and service bikes for.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Best oil on the market
    By  MATHEW,  a  Verified Buyer  on  May 19, 2022
    This is absolutely the best oil on the market
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Hard shifting in trans
    By  JAMIE,  a  Verified Buyer  on  April 25, 2022
    2020 crf450r was having a hard shifting issue 1st and 2nd gear. Decided to change from Honda GN4 to Amsoil. On very first ride big difference in trans shifting and has only gotten better. I am now a true believer in Amsoil Products
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Great motocross bike oil
    By  KYLE,  a  Verified Buyer  on  April 16, 2022
    Use this oil in my kx450f and with great results. Bike shifts smoother and the oil is alot cleaner upon change intervals!
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?