At risk of prolonging another oil thread, I think Honda recommends 10w-30 for the NT. Rotella T6 is only in 5w-30 or 5w40. Non-synthetic T4 is available in 10w-30, and it meets JASO MA2 specs. So I am considering T4 for my next oil change. T5 semi-synth is also available in 10w-30 but Shell does not indicate whether it meets JASO MA specs, at least last time I looked. Actually I think any of these oils will work well in the NT. At the end of the day, I don't think any NT owner will have problems or notice any premature wear with any of these oils.