The Screamin Eagle Synthetic Oil by Harley Davidson now shows the manufacture does know and understand that there are really great benefits of using synthetic motorcycle oil in their air-cooled engines. They have wasted /spent alot of money and time of telling their dealers and customers to not use any synthetic oils in their bikes.Well now they are selling it 
Go figure on that one.
Their Genuine H D Oil they say is best for the unique requirements of Harley-Davidson air-cooled V-twin engines…
That was until they got their lab test back,as it has over and over again been shown that the Genuine Harley Davidson Oil doesn’t provide the best protection for Harley-Davidson engines.
Have I got your attention now?
According to the facts, Four-Ball Wear Tests show that the Harley- Davidson 20W-50 Motorcycle Oil leaves a wear scar nearly 80 percent larger than that left by AMSOIL Motorcycle Oil (Synthetic 20W-50).
Click to enlarge
Notice how Amsoil provided better protection than Harley Davidson Oil (Screamin Eagle)?
So whats the deal with the Amsoil?
AMSOIL Synthetic 20W-50 Motorcycle Oil (MCV) is a premium oil designed for those who demand the absolute best lubrication for their motorcycles. AMSOIL MCV is the result of extensive research, and it is specially formulated to excel in all areas unique to motorcycles, including high temperatures of air-cooled engines such as Harley Davidson V-Twin, wet clutch lubrication, extreme pressure regions of gears and chains and rust common to short trips and storage.
Reduces Friction, Heat and Wear
In high heat conditions, engine protection is not sacrificed with AMSOIL Synthetic Motorcycle Oil. It has exceptional
high-temperature film strength and contains a heavy treatment of anti-wear additives to reduce wear regardless of the
operating conditions. AMSOIL 20W-50 Motorcycle Oil is thermally (heat) stable and contains maximum levels of oxidation inhibitor additives. It is extremely resistant to breakdown and engineered to prevent damaging sludge and
carbon de-posits for superior engine cleanliness.
AMSOIL MCV is multi-functional and fulfills the requirements of both domestic and foreign motorcycles. It outperforms other conventional and synthetic motorcycle oil.
AMSOIL, the leader in synthetic lubrication, produced the world’s first API qualified synthetic motor oil in 1972. Trust the extensive experience of AMSOIL The First in Synthetics to do the best job protecting your motorcycle.
