Look it up in the Castrol book at a parts shop. Castrol make good oils for mitsi's. And i'd be listening to their listing unless you had special needs like making much more than stock power where people run a thicker than stock oil.
If it sounds suss, if you can get your hands on a service manual the standards it must conform to if you want to double check Castrols listing.
Or mitsi Diaqueen.