So I got in touch with the Penrite Malaysia chaps. They carry both the Classic Lite 20w-60 as well as the one supposedly formulated for the Mini, Classic Mini 20w-50.
Though the special Mini one is double the price of the Classic Lite (around 38 quid vs 19 for the Classic Lite, multiplied 5.5x in Malaysian Ringgit).
Unfortunately Valvoline VR-1 20w-50 isn't available here. Valvoline doesn't carry it. They do have XLD 20w-50, and the price is comparable to the Penrite Classic Lite.
I wonder which is preferable?