Shell Rotella 5W-40 says it meets the Japanese Automotive Standards Organization (JASO) MA specification (wet clutch).
Redline 10W40 Motorcycle oil says it meets the JASO MA specification
Redline 0W40 Motorcycle oil says it meets the JASO MA specification, and if you know viscosity you know 0W40 is better during engine starting.
JASO MA Standard
If you read the JASO standard, you can use API SG, SH, SJ, SL, SM, SN as long as it is
not "Energy Conserving" as that would put it in a lower friction classification than the clutch needs for positive engagement and shock protection. This matches what the Fury Owner's Manual says on Page 85: API classification SG or higher except oils labeled as energy conserving on the circular API service label. (This is stated somewhat differently on page 86, but has the same meaning.)
Within the MA specification, MA2 oil is in the higher friction half of the MA standard, and MA1 is the lower friction MA standard (still above MB). You can determine if you light a tighter, grippier clutch (MA2), or looser clutch if shifting is notchy (use MA1).
Shell / Rotella and REDLINE are
not registered with JASO.
Honda GN4 is registered with JASO.
343* Pro Honda GN4 10W-40 Honda Motor Co., Ltd.
M001HMC274* MA 10W-40
*oil code reference number
Rotella is designed and is marketed by Shell as primarily a Heavy Duty Engine Oil. There is a $500 (40,000 Yen) fee that must be paid to JASO for certifying the testing Shell would need to perform. Shell is saying they examined the JASO MA spec and determined Rotella 10W40 meets the MA (MA2 "grippy clutch" category) requirements while 0W40 does not, but did not submit their testing for certification.
Shell Technical states:
I believe Shell says they "test and warranty" for the certification requirements. So if you use Rotella they claim is JASO MA compliant and your clutch or engine smokes because of it, and it is the fault of the oil, Shell will refund your purchase price--of the oil. With that said, however, Shell wouldn't stake its reputation on a false claim, so it
should meet the MA2 spec.
REDLINE, on the other hand, is a notably expensive brand who is marketing a line of oil specifically to motorcyclists. In my opinion if they say they're JASO MA, they ought to say if they're class MA2, MA1, somewhere in the middle of MA (like Honda GN4). What they do say is, "Blended with specific friction modifiers that are compatible with wet-clutches, suitable for JASO MA applications." To me, that says, "We think it's good enough."