The sj designation is older than the sn. Watch for any oils clawing to be energy conserving. Some if those seem to cause slipping.
So far none of the 15-40 or 10-40 oils are carrying the EC designation.
I thought the "motorcycle specific" oils had something in them to keep them from foaming up or getting air bubbles in then. Something along those lines. I read it here in DBA so I'm sure it's true.
Especially M33's location.Absolutely everything on DBA is 110% true!
It is hard to find an oil that doesnt claim to be foam resistant. I think that one of my favorite moto monthly "urban legends" (ok, gross inaccuracy or just plain lie if you will) was the one about how ATF has no anti corrosive/rust additives.