Ken Reaser Enterprises

AMSOIL Provides the Best Care

and Performance for Motorcycles

Reduces Friction, Heat and Wear

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What Every Rider Should Know

V-Twins Get Hot

Harley-Davidsons* and other bikes with big V-twin engines generate significant heat, especially in low-speed parades, in rally traffic or on long climbs on hot days. Motor oil plays a critical role in cooling these big air-cooled engines, and even more so in low-speed operation with limited wind generated to cool the bike. If the oil can’t withstand the heat, its ability to protect your bike is compromised.

Is your motorcycle protected against extreme heat?

Watch what happens when we push a 2012 Harley Davidson FXDB to 500ºF in our mechanical lab to see how AMSOIL synthetic lubricants protect against extreme heat.

Product Highlights

20W-50 Synthetic V-Twin Motorcycle Oil

Advanced multi-functional formula for both domestic and foreign motorcycles. Excellent in air-cooled motorcycle engines due to high heat resistance. Can be used in engines, transmissions and the primary chaincase. Not recommended where an API GL-4 or GL-5 gear oil is required.

20W-40 & 15W-60 Synthetic V-Twin

Motorcycle OilAMSOIL Synthetic V-Twin Motorcycle Oil is a premium oil designed for those who demand the absolute best lubrication for their motorcycles.It is the result of extensive research and is specially formulated to excel in all areas unique to motorcycles, including the high temperatures of air-cooled engines, wet-clutch lubrication, extreme-pressure regions of gears and chains, and rust protection.

10W-30 & 40 Synthetic Metric Motorcycle Oil

Whether riding aggressively, cruising or in stop-and-go traffic, AMSOIL 10W-40 Synthetic Metric Motorcycle Oil delivers the benefits most important to riders, including premium wear protection; smooth, confident shifts and cool, clean performance.

SAE 60 Synthetic V-Twin Motorcycle Oil

SAE 60 Synthetic Motorcycle Oil is a premium oil designed for those who demand the absolute best lubrication for their motorcycles. The result of extensive research, it is specially formulated to excel in all areas unique to motorcycles, including high engine RPM, wet-clutch lubrication and more.

10W-40, -50 & -60 Synthetic Dirt Bike Oil

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.

Shop the AMSOIL online store for our advanced synthetic motorcycle oils - specially formulated to provide superior performance and maximum protection in a wide variety of domestic and foreign motorcycle applications.

Don't just take our word for it.

"I'm impressed how amsoil has increased my fuel mileage in my Harley. It not only increased mileage but also has reduced engine temperature by more than 20 degrees. I have a oil temp gauge on my bike and for years I used other well known synthetic oils. No other oils reduced the temperature which will result in performance and fuel economy."

"On the Victory Forums this is always a huge debate. What oil do you use? I went with one I trusted. Bike runs smooth and cool."

"Only oil I have used in my Road King since I bought it new. I passed 50k miles last year and have never had any issues with oil loss between oil changes or oil leaks. I recommend this product to everyone I know that rides a V-Twin."

CLICK HERE TO VIEW ALL AMSOIL MOTORCYCLE OIL PRODUCTS

How A Motorcycle Wet Clutch Works

Lubricating a clutch with oil seems like an invitation for slippage and inconsistent shifts. However, a properly formulated oil can reduce clutch slippage. Here’s how.

Wet clutches are widely used in motorcycles and dirt bikes. The term simply means the clutch is lubricated with oil, as opposed to a dry clutch. A wet clutch typically lasts longer and is more forgiving to operate than a dry clutch.

Frictional Performance Vital
As shown in the images, the clutch connects the engine and transmission via a series of alternating friction and steel plates. Friction plays a big role in proper clutch operation.

To illustrate, imagine sitting aboard a motorcycle or dirt bike with the clutch lever activated, idling at a red light or in a starting gate. The friction and steel plates are separated, allowing the bike to run without moving. The light turns green or the gate drops. As you let out the clutch lever, the plates squeeze together. The transition from the friction and steel plates spinning independently to becoming locked together is an example of dynamic friction. Once the plates are locked together and spinning in unison, they’re subject to the principles of static friction.

Oil Chemistry Important
Motor oil plays a vital role in both areas. The formulation influences the dynamic friction you experience, which is best thought of as clutch feel. Oils with incorrect frictional properties can result in inconsistent or “loose” clutch feel. This negatively affects your ability to confidently pull away from a red light without the bike cutting out, or start quickly and grab the holeshot in a race. The oil also contributes to the holding power, or static friction, between the plates once the clutch lever has been let all the way out and you’re riding. Oils with incorrect frictional properties can allow the plates to slip in some circumstances, which you’ll feel as lost power to the ground. A powerful V-twin riding up a hill, for example, can generate sufficient load to cause the clutch plates to slip and the bike to surge.

The oil’s additive chemistry has the greatest effect on performance. Friction modifiers, added to some passenger car/light truck motor oils to maximize fuel economy, can decrease the coefficient of friction within the clutch pack and result in excessive slippage. Extreme-pressure additives, commonly used in gear lubes to protect against shock loads and intense pressures, can cause excessive clutch slippage and related damage.

The key is to use a lubricant specifically formulated for wet clutches. AMSOIL Synthetic V-Twin Motorcycle Oil, Synthetic Metric Motorcycle Oil, Synthetic Dirt Bike Oil and Synthetic Dirt Bike Transmission Fluid contain no friction modifiers or extreme-pressure additives. They’re dialed-in with the correct frictional properties to promote smooth shifts and consistent clutch feel while guarding against wear for long clutch life.