myself i think castrol is fine the most important thing is to change it often if you drive it hard it only takes one little bit of metal to jam a valve in the auto!
diff oil
i use MACK approved gear oil something like 140w and stick like you know what to a blanket if its an lsd just use a good lsd oil and again change more frequently to keep crap out of the barrings
powersteering fluid
just DX-III again
brake fluid
non race well just heavy duty castrol again
engine oil
for my turbo engine i will be using CAT turbo diesel approved stuff its hi detergent means changing more often but a cleaner engine, its VERY good stuff to pass there testing and ill get it cheap