I believe that Shell Rotella now has a T6 Full syn 5w30 All Vehicle, I have been using the Rotella 5w40 T6 in my Dodge 5.7l for years but I think they are making some changes to it to meet new Diesel requirements and it is loosing its SN rating, although it is still JASO MA rated for wet clutch motorcycles which to my knowledge are all gas engines, so it may just be the regulations that are changing and not the oil.
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