I don't know if those are availible there, but the best engine oils on the market I know are:

-Castrol TWS Motorsport
-Motul 300V Competition

the latter being less recomended for everyday use.

Differential oils I use recomended by people from Castrol Poland are:

-gearbox - SMX-S
-transfer - Transmax Z
-diffs - SAF-XO (in Poland very rare, I got it from BMW dealership at last)


I heard something about great diff oils form Redline? or simmilar named company. They produce something like 80W140 diff oil for really abused diffs