Synthetic Motorcycle Oil FAQs

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Synthetic Motorcycle Oil FAQs
  • Can I use AMSOIL synthetic motorcycle oil without voiding my motorcycle’s warranty?

    Yes. Using AMSOIL synthetic motorcycle oil has no effect on motorcycle warranties. A federal law called the Magnuson-Moss Act (1975) prevents original equipment manufacturers from putting conditions on warranties attached to any product or service identified by brand, trade or corporate name, unless the manufacturer provides that product or service free of charge. This means consumers have the freedom to use aftermarket products of their choice without fear of losing the original limited or implied warranty. For additional information, visit www.amsoil.com/warrantysecure, or contact the AMSOIL Technical Department at (715) 399-TECH (8324) or tech@amsoil.com.

  • Will extending oil drain intervals void my motorcycle’s warranty?

    No. Extending oil change intervals will not void new motorcycle warranties. To affect the motorcycle warranty, it must be determined that the lubricant was directly responsible for the failure; if the oil didn’t cause the problem, the warranty cannot be voided, regardless of brand or length of time in use. For additional information, visit www.amsoil.com/warrantysecure, or contact the AMSOIL Technical Department at (715) 399-TECH (8324) or tech@amsoil.com.

  • What AMSOIL motor oils are recommended for Harley-Davidson motorcycles?

    AMSOIL 20W-50 Synthetic Motorcycle Oil and SAE 60 Synthetic Motorcycle Oil are the most commonly recommended oils for Harley-Davidson applications. Check the AMSOIL Motorcycle Product Lookup for specific recommendations.

  • What is the difference between Formula 4-Stroke® 10W-40 Synthetic Scooter Oil and 10W-40 Synthetic Motorcycle Oil?

    AMSOIL 10W-40 Synthetic Motorcycle Oil contains a robust additive package designed for the extreme pressures and high temperatures common in motorcycle applications. Its high TBN retention also makes it the appropriate choice for extended drain intervals. In scooter applications, Formula 4-Stroke 10W-40 Synthetic Scooter Oil is the more economical choice.

  • What is the recommended transmission lubricant for a Harley-Davidson Big Twin?

    In newer Big Twins, AMSOIL recommends AMSOIL 20W-50 Synthetic Motorcycle Oil or Severe Gear® 75W-110 Synthetic Gear Lube. In older Harleys, such as Knuckleheads, Panheads and Shovelheads, SAE 60 Synthetic Motorcycle Oil is recommended.

  • Are AMSOIL synthetic motorcycle oils wet-clutch compatible?

    Yes. AMSOIL synthetic motorcycle oils meet JASO MA2 friction requirements for use in wet-clutch applications.

  • Is AMSOIL Synthetic Chaincase & Gear Oil acceptable to use in the primary chaincase of a Harley-Davidson Big Twin?

    AMSOIL Synthetic Chaincase & Gear Oil does not have the correct viscosity for use in Harley-Davidson primary chaincases, and is not recommended for these applications. AMSOIL 20W-50 Synthetic Motorcycle Oil is recommended for Harley-Davidson primary chaincases.

  • How can AMSOIL recommend 20W-50 Synthetic Motorcycle Oil for use in the primary chaincases and transmissions of certain motorcycles?

    AMSOIL synthetic motorcycle oils are engineered with additive packages specifically designed to provide high performance in motorcycle engines, transmissions and primary chaincases.

  • What is the oil change interval for AMSOIL synthetic motorcycle oils?

    AMSOIL synthetic motorcycle oils are engineered to provide outstanding protection for up to twice the manufacturer’s recommended change interval or one year, whichever comes first. Unless using an AMSOIL Ea Motorcycle Oil Filter, change the filter based on the manufacturer’s recommended interval. For Big Twin Harley-Davidson transmissions, follow the Harley-Davidson recommended drain interval for synthetic oil up to 20,000 miles or one year, whichever comes first.

  • Are AMSOIL synthetic motorcycle oils different from AMSOIL synthetic automotive oils?

    Yes. In addition to withstanding extreme pressure, protecting against rust and withstanding high temperatures, motorcycle oils must be compatible with wet clutches. AMSOIL synthetic motorcycle oils are designed to meet the unique frictional requirements necessary for wet-clutch compatibility and provide maximum protection and performance in these applications.

  • Why does AMSOIL offer more than one viscosity motorcycle oil?

    AMSOIL offers motorcycle oils in different viscosities to accommodate the differences between motorcycle models and manufacturers. Just as in automotive applications, motorcycle engines require specific oil viscosities for optimal performance and protection based on the components and tolerances in the engine. Check the AMSOIL Motorcycle Product Lookup for specific recommendations.

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