3500S Gearbox Oil

In case you weren't aware,
Millers due a oil that would seem ideal for the 'S' 'box.
It's a 20w50 motor oil with EP additives, designed for engines and gearboxes that share the same oil (i.e. Mini's).

It is called Classic Trans M and comes in mineral or semi-synthetic (s-s donoted by 'Sport').

I use 'Trans M Sport' in my 3500S and the gearbox is smooth, slick, quiet and i believe better protected.