I have read through all the oil posts, and nobody seems to have covered the regular Amsoil 10W-40 vs the MC version of the Amsoil 10W-40. Both oils have the appropriate JASO-MA approval and are listed as "wet clutch safe" and appropriate for motorcycles. There is about $1.27 per quart difference in the price. Thoughts? Is this the same oil in two different bottles or is there a different additive package?