A 5L jug of Castrol Syntec fits the rear trunk cubby hole nicely in the F30's trunk.

And I got kicked out of the Bimmer shop (figuratively)... they say my maintenance schedule I came up with was excessive (well, Bavauto’s), I didn’t need oil, transmission nor rear diff change at 45k kms. I was just following the schedule to double up factory recommendations, guess they are really backed up.