I would personally stay away from this oil because its Ca / Mg ratio is less than 1 (well less than 1 indeed). Mg is certainly corrosive and increases wear at high ratios; although, it's a good TBN retainer (helps retain initial TBN).
Answering question on high initial TBN, both Mg and Ca will result in increasing the high initial TBN. They both come from detergents, which means they are both bases (as in total base number [TBN]).
I like the high ZDDP (phosphorus) though. But the unusually large ratio of Mg in this oil is enough for me not to consider it.
Thanks for the VOA, as always.