Hi Andy
I would use a 5w-40 synthetic in the engine.
5w-40 engine oil | 5w40 oil Out of those, the best ones are the Fuchs/Silkolene Pro S, Millers CFS/CFS NT, Motul 300V, Red Line and Gulf Competition. The Motul 8100 X-Cess, Millers XF Longlife, Fuchs GT1 XTL/Supersyn, Gulf Formula G, Shell Helix and Mobil Super 3000 are good, cheaper alternatives.
You need a 75w-90 for the gearbox, transfer box and diff.
75w-90 Gear Oils for your Car from Opie Oils If you want to go for the best, the Millers CRX 75w-90 NT, Gulf Competition, Motul Gear 300, Red Line MT90 and Millers TRX are ideal for the gearbox. The Castrol Universal, Motul Motylgear and Fuchs Gear Syn are all decent alternatives. The Fuchs Syn 5, Millers CRX, Redline 75w-90 GL5, Motul Gear 300 and Gulf Competition are ideal for the diff and transfer box. The Fuchs Sintopoid, Castrol Syntrax Longlife, Millers TRX, Motul Motylgear, Mobil SHC and Amsoil FGR are also good choices.
You need an an ATF for the AYC and power steering and I would go for either the Amsoil ATF, Motul Multi ATF, Fuchs ATF4400, Gulf Multi Vehicle ATF, Castrol ATF Multi Vehicle or Millers Millermatic ATF SPIII.
Automatic Transmission Fluid and ATFs from Opie Oils Cheers
Tim