I think this relevant to rotellaT vs. T6 ....
Quote:
It is important to note that as an oil classification is superseded by a newer one, that the newer one provides improved benefits over the older one in such areas as high and low temperature deposits, wear, rust and corrosion for example and is perfectly suitable for use. All quality motorcycle specific oils should also carry the JASO Motorcycle Specifications, which are either the JASO-MA specification (no friction modifiers) or the JASO-MB specification (with friction modifiers). The JASO-MA rating specifies that no friction modifiers are used. Note that the JASO-MB motorcycle does have friction modifiers, but is designed for motorcycles that specify the JASO-MB specification. If the oil does not carry one of these specifications, even if the other specifications listed above are present, We recommend finding an oil that has the proper JASO specification clearly labeled on the bottle.
http://www.smartsynthetics.com/articles/motorcycle_oil_technical_facts.htm
