this is everything you need to know straight from the engineers themselves...
Though marketed as an engine oil for diesel trucks, Rotella oil has found popularity with motorcyclists as well. The properties of heavy duty engine oils tend to map to the same requirements of motorcycle oils, particularly those whose engine and transmission share the same oil. (This is called a "shared sump" design, which is unlike automobiles which maintain separate oil reservoirs - one for the engine and one for the transmission). The chemical additives found in heavy duty engine oils work well with motorcycles. In addition, the lack of "friction modifiers" in truck oils such as Rotella means they do not interfere with proper wet clutch operations.
Though not yet officially announced by Shell, posts in various motorcycle-related forums cite e-mail confirmation from Shell that Rotella 15W-40 CJ-4 has been tested and shown to meet the JASO-MA friction test. This particular certification is important for motorcycles because of the clutch design which is bathed in the engine oil. This is known as a "wet clutch." Oils that have excessive "friction modifiers" tend to make wet clutches slip. Indication that Rotella T Triple Protection passes the JASO-MA friction test offers one more reason to seriously consider Rotella T for motorcycle use.
Motorcycle specific oils tend to cost between $8 and $10 per quart. Shell Rotella T 15W-40 costs about $10 per gallon (or about $2.50/quart). The price economy of Shell Rotella T allows a motorcycle owner to change oil more frequently, thus matching the "extended change interval" value of motorcycle specific synthetics.
Originally Posted by Richard Moore, Staff Engineer, Shell Global Solutions (US) Inc.
Westhollow Technology Center, PO Box 4327, Houston, TX 77210, United
States of America
We recently ran the JASO MA friction test on Rotella T with Triple
Protection 15W-40, Rotella T Synthetic 5W-40 (CI-4) and our soon to be
introduced (within the next 2 months) Rotella T Synthetic 5W-40 CJ-4.
All three oils passed the wet clutch friction test. Rotella T Synthetic
5W-40 (CI-4) has more than 1.2% ash (JASO MA spec limit) so it can not
be classified as JASO MA. However, Rotella T with Triple Protection
15W-40 and our soon to be introduced Rotella T Synthetic 5W-40 CJ-4 do
meet JASO MA."
If you have any additional questions please call us at 800-231-6950.
Thank you for your interest in Shell products.
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Last edited by reevesmreeves; 06-28-2008 at 08:10 AM.