As recommended by Kawasaki in owner's manual, JASO MA: Japanese Automotive Standards Organization- High friction applications (wet clutch).
Shell's new formula Rotella T6 synthetic and Rotella T5 semi-synthetic diesel oils are now available for a reasonable price compared to motorcycle specific oil.
"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 new Rotella T6 Synthetic 5W-40 CJ-4. All three oils passed the wet clutch friction test. Rotella T Synthetic 5W-40 CI-4 (now discontinued) 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 new Rotella T6 Synthetic 5W-40 CJ-4 do meet JASO MA."
Shell Global Solutions (US) Inc.
Westhollow Technology Center, PO Box 4327, Houston, TX 77210, USA, 800-231-6950.
Shell's new RotellaT6 Synthetic 5W-40 CJ-4
delivers 34% better wear performance on average compared to previous Rotella T Synthetic 5W-40 CI-4... Rotella T5 Synthetic Blend 10W-40 CJ-4
would be a good choice too.
Total base number is 10.6 for Shell Rotella T6, and 10 for Rotella T5, so the oil would be pretty durable and protective during normal and extended oil drains. Pretty good compared to Amsoil 0W-40 AFF's 10.5 like I use, and Amsoil 10W-40 MCF's 11.1.
Shell synthetic Rotella T6 specs
Shell synthetic blend Rotella T5 specs
Total Base Number (TBN) is a measure of a lubricant's reserve alkalinity. It is measured in milligrams of potassium hydroxide per gram (mg KOH/g).TBN determines how effective the control of acids formed will be during the combustion process. The higher the TBN, the more effective it is in suspending wear-causing contaminants and reducing the corrosive effects of acids over an extended period of time. The associated measurement ASTM D2896 and ASTM D4739-06 generally range from 6-80mg KOH/g in modern lubricants, 7-10mg for general automotive use and 10-15 for Diesel operations.