Thanks for that, interesting read.Dont know for hx5 15w40 (they didnt test it yet).....but hx5 10w40 is gr. I + VHVI (or even GTL) blend...
Oil-club.ru Shell (HX5) 10w40
That Shell 10W40 was rated API SL / CF only and was a Group I and Group III semi-synthetic according to the ROC.
I’m not sure, but I’ve heard that to meet the deposit requirements of API SN an oil needs to be a minimum of Group II or Group II + III. Which is why, given the OP’s selection above, I would avoid the Total Quartz.