AMSOIL 10W-60 100% Synthetic Dirt Bike Oil
AMSOIL 10W-60 100% Synthetic Dirt Bike Oil is the heaviest grade in the AMSOIL Synthetic Dirt Bike Oil family, a JASO MA wet-clutch four-stroke motorcycle oil engineered for KTM and Husqvarna race four-strokes whose service manual specifies SAE 10W-60. It carries API SG, SJ, SH, and SL service categories and is built for the film thickness, shear stability, and consistent clutch feel demanded by race-prepped engines that share an oil sump with the transmission and wet clutch.
Race-start clutch consistency under repeated abuse
Friction-durability is the headline property for any wet-clutch motorcycle oil, and AMSOIL Synthetic Dirt Bike Oil is built around it. The formula helps minimize clutch slippage, fade, and chatter so the lever stays predictable from the first gate drop through long motos. In an extreme simulated-start test, AMSOIL Synthetic Dirt Bike Oil continued to deliver consistent clutch feel after 32 simulated race starts, while a leading original equipment manufacturer (OEM) branded oil showed inconsistent clutch-lever action and poor clutch feel after 16 starts. Clutch plates run on the AMSOIL oil remained clean, while plates run on the OEM oil showed discoloration and wear.
Maximum film thickness for race-prepped four-strokes
High-strung KTM SX-F and Husqvarna FC race engines push past 13,000 rpm and load shared transmission gears that chop conventional oils thin. Kinematic viscosity at 100°C measures 23.2 cSt (ASTM D445), the heaviest in the AMSOIL Synthetic Dirt Bike Oil family, and high-temperature, high-shear (HTHS) viscosity is 5.8 cP at 150°C (ASTM D5481), pointing to a thicker load-bearing film between gear teeth, bearing surfaces, and piston skirts under sustained high-rpm operation and extreme heat. Premium anti-wear additives reinforce that film, with a four-ball wear scar of 0.52 mm (ASTM D4172, 40 kgf, 150°C, 1800 rpm, 1 hr).
Shear-stable viscosity that stays in grade
Synthetic base stocks resist mechanical shear and viscosity loss, keeping the oil inside its target SAE 10W-60 envelope across long sessions. Viscosity index measures 178 (ASTM D2270), the highest VI in the AMSOIL Synthetic Dirt Bike Oil family, which describes a fluid that holds a more uniform viscosity from cold start to operating temperature. For shared-sump engines that lubricate a hardened gearbox and wet clutch with the same oil that lubricates the top end, this shear stability protects clutch life, gear faces, and ring lands as hours accumulate.
Heat tolerance, low volatility, and cold flow
NOACK volatility (ASTM D5800) measures 3.5 percent weight loss, the lowest in the AMSOIL Synthetic Dirt Bike Oil family, which means very little of the oil flashes off in the hottest parts of the engine. That helps control oil consumption between changes and reduces deposit formation on pistons, ring lands, and the clutch basket. The flash point is 250°C (482°F) and the fire point is 274°C (525°F) per ASTM D92, and the pour point reaches -36°C (-33°F) per ASTM D97, supporting confident cold cranking in cool-morning practice and start-of-season riding.
JASO MA wet-clutch spec and API service categories
AMSOIL 10W-60 100% Synthetic Dirt Bike Oil meets JASO MA, the wet-clutch friction standard developed for shared-sump four-stroke motorcycle engines, and carries API SG, SJ, SH, and SL service categories. KTM and Husqvarna riders whose owner manual lists a JASO MA, SAE 10W-60 motorcycle oil as the recommended grade for race or high-output use can run this product as a direct factory-fill replacement. For machines that specify 10W-40 or 10W-50 instead, the AMSOIL Synthetic Dirt Bike Oil family also lists those grades.
Recommended applications and service intervals
Use AMSOIL 10W-60 100% Synthetic Dirt Bike Oil in any dirt bike whose service manual calls for SAE 10W-60 motorcycle oil, including KTM and Husqvarna four-strokes. The heavier 10W-60 grade is the right pick for race-prepped engines and for owners running high-compression pistons, ported heads, or stage tunes that benefit from added film thickness. Riders whose machines call for 10W-40 or 10W-50 should select those grades from the AMSOIL Synthetic Dirt Bike Oil family.
- Change AMSOIL 10W-60 Synthetic Dirt Bike Oil according to the vehicle manufacturer's recommendations; race schedules typically tighten this interval based on engine hours, fuel quality, and dust exposure.
- Compatible with other synthetic and conventional motor oils; mixing shortens life expectancy and reduces performance benefits, and extended intervals are not supported on mixed fills.
- Aftermarket oil additives are not recommended for use with AMSOIL Synthetic Dirt Bike Oil.
- Confirm viscosity grade, JASO classification, and capacity for a specific KTM or Husqvarna model using the AMSOIL vehicle lookup.
Pair AMSOIL 10W-60 Synthetic Dirt Bike Oil with a fresh, OEM-spec motorcycle oil filter at every change, replace the crush washer on the drain plug, and follow the manufacturer's torque values to prevent leaks.
Typical technical properties
| Property | Value (DB60) |
|---|
| Kinematic Viscosity at 100°C, cSt (ASTM D445) | 23.2 |
| Kinematic Viscosity at 40°C, cSt (ASTM D445) | 156.7 |
| Viscosity Index (ASTM D2270) | 178 |
| Flash Point, °C (°F) (ASTM D92) | 250 (482) |
| Fire Point, °C (°F) (ASTM D92) | 274 (525) |
| Pour Point, °C (°F) (ASTM D97) | -36 (-33) |
| NOACK Volatility, % weight loss (ASTM D5800) | 3.5 |
| High-Temperature/High-Shear Viscosity at 150°C, cP (ASTM D5481) | 5.8 |
| Four-Ball Wear Test, scar diameter, mm (40 kgf, 150°C, 1800 rpm, 1 hr) | 0.52 |
| Foam Test (ASTM D5182, Sequences I, II, III) | 0/0, 20/0, 0/0 |
| Total Base Number | 7.6 |
Order AMSOIL 10W-60 100% Synthetic Dirt Bike Oil
AMSOIL 10W-60 100% Synthetic Dirt Bike Oil ships in a quart bottle (product code DB60QT-EA) and a case of twelve quarts (product code DB60QT-CA). The product is Warranty Secure, keeps the factory warranty intact when used as a high-performance replacement for vehicle manufacturer branded products, and is backed by the AMSOIL Limited Warranty. For application match by year, make, and model, start with the AMSOIL vehicle lookup, and to compare 10W-40, 10W-50, and 10W-60 dirt bike grades plus 2-stroke premix options, see the motorcycle oil products. Order AMSOIL 10W-60 100% Synthetic Dirt Bike Oil.
Customer reviews
5.0Based on 184 reviews
Great Oil
I have run this oil in all my bikes for several years and no complaints at all, all valves stay within spec etc no clutch concerns and do like the clutch feel with the oil.
By Kyle from UT on April 28, 2026.
Would recommend this to a friend.
Oil
AMSOIL who is the best I use it in my XR 250 R Honda my Honda four wheeler and all my Harley’s the only drawback is that it’s very expensive I would run it in my Ford 7.3 diesel but that takes 15 quarts would cost over $200 for oil that’s just too much.
By Pete from Pennsville, New Jersey on April 17, 2026.
Would recommend this to a friend.
10W-40 dirt bike oil
Great product, been using this on a 2024 Honda CRF150R since new. Changed regularly due to racing the bike. Seems to hold up very well. Will continue to use it.
By Ryan from Pennsylvania on March 07, 2026.
Would recommend this to a friend.
Read all 184 reviews
Frequently asked questions
Which dirt bikes require 10W-60 motorcycle oil?
The 10W-60 grade is recommended for dirt bikes whose service manual calls for SAE 10W-60 motorcycle oil, including KTM and Husqvarna race four-strokes. Owners of race-prepped or aftermarket-tuned engines that benefit from extra film thickness also run this grade. Confirm the grade for a specific KTM SX-F or Husqvarna FC model with the AMSOIL vehicle lookup.
Is AMSOIL 10W-60 Synthetic Dirt Bike Oil JASO MA approved for wet clutches?
Yes. AMSOIL 10W-60 100% Synthetic Dirt Bike Oil meets JASO MA, the friction standard developed for shared-sump four-stroke motorcycle engines with wet clutches, and it carries API SG, SJ, SH, and SL service categories. The clutch-friction performance has been validated in an extreme simulated-start test, where the formula continued to deliver consistent clutch feel after 32 simulated race starts.
Can 10W-40 or 10W-50 dirt bike oil be substituted for 10W-60?
Substituting a lighter grade in an engine that calls for 10W-60 is not recommended. The 10W-60 grade is targeted at engines designed around its higher kinematic viscosity (23.2 cSt at 100°C) and 5.8 cP HTHS film thickness; lighter grades reduce that load-bearing film. Riders whose service manual lists 10W-40 or 10W-50 should run those grades from the AMSOIL Synthetic Dirt Bike Oil family instead.
How often should AMSOIL 10W-60 Synthetic Dirt Bike Oil be changed?
Change the oil according to the dirt bike manufacturer's recommendations in the owner manual. Race teams typically tighten that interval based on engine hours, fuel quality, and dust exposure. For capacity and application match guidance for KTM SX-F and Husqvarna FC machines, use the AMSOIL vehicle lookup.
Can passenger-car 10W-60 motor oil be substituted in a dirt bike?
Substituting a passenger-car 10W-60 in a dirt bike that calls for a motorcycle oil is not recommended. Passenger-car oils often contain friction modifiers that can cause wet-clutch slippage and are not formulated for the shear loads of motorcycle transmission gears. AMSOIL 10W-60 Synthetic Dirt Bike Oil is JASO MA wet-clutch friendly and shear-stable for shared-sump KTM and Husqvarna four-strokes.
Will AMSOIL Synthetic Dirt Bike Oil void a factory warranty?
No. AMSOIL 10W-60 Synthetic Dirt Bike Oil is Warranty Secure, keeping a factory warranty intact when used as a high-performance replacement for vehicle manufacturer branded oils, and is backed by the AMSOIL Limited Warranty. To confirm the right grade for a specific dirt bike, consult the motorcycle oil products and the owner manual.
