Are you trying to save money, or do you want the best protection, or do you want good oil at a good price?
In my humble opinion.......you do NOT want an oil that is SM rated, as it has too many friction modifiers and will slip the wet clutch, regardless of what the oil bottle says. You DO want the oil to be JASO-MA rated, but ideally JASO-MA2 rated. API SH, SJ or SL rated should work, but is not ideal.
0w-40 is acceptable, this is what BRPs full synthetic all-climate XPS is. 5w-40 is acceptable, this is what BRPs semi synthetic summer blend is. 10w-40 is acceptable, as long as you are not doing cold starts below like 40 degrees. Ideally you want a TRUE full synthetic, like Amsoil. Then there are oils labeled full synthetic, but they are not a TRUE synthetic, but still good. At a minimum use a semi synthetic, as a dino oil with the JASO-MA rating might not be good enough. The weaker oils will shear quicker in the gearbox, as evidenced by oil analysis.
So to recap, does the oil say it is SM (or now SN) rated? Do not use it. Does the oil bottle say JASO-MA? Good. JASO-MA-2? Better. Full synthetic? Good. Semi synthetic? OK. No synthetic? Not good.
There are many good oils available. Amsoil. Castrol Power 1 Synthetic 4T is a good one. Valvoline full synthetic Motorcycle oil is well known. I am currently using Maxima Pro Plus 10w-40 full synthetic with ester, JASO-MA2 rated. Bajaron has sold truckloads of Amsoil for Spyders, we know this is very very good TRUE synthetic oil. I know the Maxima is a TRUE synthetic.
And finally, manual or auto, twin or triple, what works OK in one might not work OK in another. The twin auto is more sensitive that the triple auto. Auto is more sensitive than the manual. Whatever you pour in, pay attention to how the clutch feels. If it is slipping, drain the oil and try another. The choice is yours. And this is all just my opinion. Make it easy and just order your filters and oil from Bajaron, problem solved.