Honda 2006 RC51 Owner's Manual page 100

Engine Oil & Filter
JASO T 903 standard
The JASO T 903 standard is an index for
engine oils for 4-stroke motorcycle
engines.
There are two classes: MA and MB.
Oil conforming to the standard is labeled
on the oil container. For example, the
following label shows the MA
classification.
(1)
(2)
(1) code number of the sales company
of the oil
(2) oil classification
93
Servicing Your Honda
www.ClassicCycles.org