High detergent &/or low silicone oils could aggravate an oil foaming problem for the M96. I suggest you need some independent advice on oil selection - for example Bob is the Oil Guy forum.I am not qualified to knock the DT40.
You may find this interesting since it mentions Mobil 1.?
http://986forum.com/forums/performance-technical-chat/55359-hunt-find-best-possible-oil.html
and BTW the expert (not me!) suggests using Caterpillar for UOA not Blackstone - and changing oil more frequently than once/yr.
http://www.empire-cat.com/Parts_and_Services/Service/S_O_S_Fluids_Lab/Engine_Oil_Analysis___Testing.aspx