For decades, Harley-Davidson recommended petroleum-based oil for its air-cooled engines.
However, recent tests show synthetic oils provide better protection.
In 2023, Harley launched its own synthetic – Screamin’ Eagle Synthetic Motorcycle Oil.
While a step in the right direction, does it really offer the best defense against wear?
Independent lab tests tell the real story.
In 150-degree C four-ball wear tests, AMSOIL Synthetic Motorcycle Oil outperformed Screamin’ Eagle by nearly 80%!
Three steel balls rotated against a fourth in each lubricant. AMSOIL’s average wear scar was significantly smaller, demonstrating superior protection.
What makes AMSOIL so effective?
Its synthetic base stocks and high-temperature additives withstand oxidation and deposits better.
Harley engines work hard, reaching 240+ degrees F in traffic.
As heat rises, petroleum and Screamin’ Eagle break down faster, reducing lubrication and increasing friction.
Contaminants like water and combustion byproducts also lead to deposits over time.
While Harley pushed regular changes to remove these, synthetics like AMSOIL stay cleaner longer.
Riders enjoy protection for more miles between services without compromising performance.
Screamin’ Eagle marketing claims it’s “tested and certified” for Harleys.
But AMSOIL has proven compatible with millions of motorcycle miles. And at $2/quart more, Screamin’ Eagle simply can’t match AMSOIL’s value.
Its filters and air filters also provide the ultimate defense for top-performing Harleys.
Between superior wear protection, lower operating temps, and extended drain intervals up to double the manufacturer’s recommendation, AMSOIL Synthetic Motorcycle Oils deliver unbeatable defense for Harley engines.
Their proven performance and protection make AMSOIL the clear choice for serious riders.