Recommended for use up to twice the motorcycle’s
manufacturer-recommended change interval (miles/hours) or one
year, whichever comes first, in engines and transmissions. For
Big Twin* Harley-Davidson transmissions only, follow the HarleyDavidson recommended drain interval for synthetic oil of up to
20,000 miles or one year, whichever comes first. When using
an engine filter other than an AMSOIL Ea® Motorcycle Oil Filter,
change the filter at standard intervals.
For off-road use, change AMSOIL Synthetic Motorcycle Oil at the
motorcycle’s manufacturer-recommended intervals.
Racing or modified engines are excluded from extended drain
interval recommendations. Oil changes are at the owner’s
discretion.