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AMSOIL Motorcycle Products: What Oil Should I Use in My Motorcycle?

Dirt Bike, V-Twin and Metric Oils fill out the AMSOIL Synthetic Motorcycle Oil line.

With the introduction of several new and repackaged motorcycle products this year, AMSOIL offers something for every type of biker, from motocross racers and off-road riders to V-Twin and metric enthusiasts. AMSOIL motorcycle products deliver the power, performance and protection that every biker wants, no matter the motivation for getting on the bike. 

Prepare your Bike for Summer Riding

Bikers of all stripes are gearing up for another season of motorcycle rallies and summer road trips. Whether you’re into V-twins or metric bikes, AMSOIL synthetic motorcycle oils are dialed-in to meet the unique demands of your bike.

Dirt Bike

To satisfy the demand for dirt-bike-specific oil, AMSOIL developed Synthetic Dirt Bike Oil in three viscosities, including 10W-40 (DB40)10W-50 (DB50) and 10W-60 (DB60).

AMSOIL Synthetic Dirt Bike Oil is designed to deliver consistent clutch feel and improve the performance of both bike and rider. Superior clutch consistency lets off-road (trail) riders expertly navigate trail obstacles without sacrificing momentum, helping them stay at the front of the pack. It also allows motocross racers the control needed to accurately time the gate drop to grab the holeshot. 

V-Twin Motorcycles

Powerful, hot-running V-twins generate intense heat, especially in slow-moving rally or parade traffic. Air-cooled bikes rely on a steady flow of air over the cooling fins to conduct heat away. Stop-and-go driving and periods of idling on hot summer days can quickly cause the engine temperature to skyrocket. If a motorcycle oil cannot withstand hot operating temperatures, its ability to provide adequate engine protection is compromised.

In addition, the intense heat and mechanical action inside a motorcycle engine can cause motorcycle oils to lose viscosity, or shear. Bikes that share a sump between the engine and transmission are especially prone to viscosity loss due to shear. AMSOIL Synthetic V-Twin Motorcycle Oil is shear stable and does not thin from mechanical activity. It does an excellent job protecting your expensive bike against wear.

AMSOIL 20W-40 Synthetic V-Twin Motorcycle Oil was developed to cater to the increasing popularity of Victory and model-year 2013 and newer Indian motorcycles*, providing riders with the security of knowing their bike engines are protected against extreme heat, internal wear and damaging sludge and deposits.

AMSOIL Synthetic V-Twin Transmission Fluid and AMSOIL Synthetic V-Twin Primary Fluid are purpose-built for bikers who prefer a dedicated transmission or primary lubricant over a multi-use product, offering customers more options. Together, their robust formulations protect against damage from shock-loading, premature wear, clutch slippage and thermal breakdown and deliver the confidence of smooth starts, quiet operation and more effective riding.

AMSOIL 20W-50 Synthetic Motorcycle Oil provides superior protection for newer V-Twins, including the ever-popular Harley-Davidson*. In addition to being a cost-effective, high-performance alternative for original equipment manufacturer (OEM)-branded lubricants, AMSOIL Synthetic Motorcycle Oil provides superior primary chaincase, transmission and engine protection in one convenient package.

AMSOIL SAE 60 Synthetic Motorcycle Oil is a premium oil for early model air-cooled V-Twin engines specifying a 60-weight motor oil. It is specially formulated to excel in wet-clutch lubrication, extreme-pressure protection of gears and preventing rust common to short drives and storage.


The metric motorcycle market is divided into three segments.
  • Metric Touring
  • Metric Sport Bikes
  • Metric Cruisers


Sport bikes (crotch rockets) need wet-clutch-compatible lubricants that deliver consistent shift performance. The high speeds and rpm at which riders travel can cause oil to foam, requiring lubricants that offer superior foam control.

AMSOIL Synthetic Metric Motorcycle Oil helps you push your bike to the edge. Its advanced synthetic technology maximizes engine responsiveness while delivering excellent wet-clutch compatibility for smooth shifts. By controlling foam, it helps you confidently push your engine toward the red line for maximum speed, acceleration and cornering ability.


Like sport bikes, metric cruisers are defined by engine responsiveness, power and speed. Superior handling, easy shifting and reliability are also important traits.

AMSOIL Synthetic Metric Motorcycle Oil delivers smooth, confident shifts and excellent wear protection. By resisting extreme heat and helping cool hot engines, it promotes peace of mind and confidence.


Metric touring bikes typically accentuate comfort, luxury and the adventure associated with long, cross-country trips. AMSOIL Synthetic Metric Motorcycle Oil enhances reliability by delivering superior engine protection. Its outstanding performance provides the security of knowing your bike is going to provide trouble-free operation mile after mile. It extends drain intervals up to twice the bike manufacturer’s recommendations, allowing you to enjoy peace of mind when far away from home and unable to stop for an oil change. AMSOIL Synthetic Metric Motorcycle Oil’s wet-clutch compatibility enables smooth shifts for a comfortable ride.

To round out the entire motorcycle oil line, AMSOIL 10W-30 (MCT) and 10W-40 Synthetic Metric Motorcycle Oil (MCF) were repackaged and reintroduced with a more specific focus on metric motorcycle applications. 

AMSOIL Synthetic Metric Motorcycle Oil is formulated to provide smooth shifts, excellent wear protection, extreme heat resistance and trouble-free operation in metric cruisers, sport bikes and touring bikes, including Kawasaki, Yamaha, Suzuki and Honda.* 

* All trademarked names are the property of their respective owners and may be registered marks in some countries. There is no affiliation or endorsement claim, express or implied, made by their use. AMSOIL products are formulated to meet or exceed the performance requirements set forth by the manufacturers of all applications shown/listed here.

No matter the bike, AMSOIL has you covered. Visit for the complete product line.

“In the eight motos I’ve raced since installing it,” Belcher said, “I’ve pulled four holeshots, three second-place starts and one third-place start. I’ve pulled holeshots in cool and dry conditions, cool and wet conditions and in hot and humid conditions. With AMSOIL Dirt Bike Oil, there’s no clutch fade at all.”
 Tom Belcher 
AMSOIL guarantees the performance of its products, so you can be confident they perform as advertised. AMSOIL introduced the world’s first API-qualified synthetic motor oil and has since introduced a full line of industry firsts. For more than 40 years, AMSOIL synthetic lubricants have proven themselves in the lab, on the racetrack and on the highway.

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