Engine oil,a good 10W40 or 15w40
It takes 7 litres which wil put it on the mark on the dipstick (well should do)
Oils for axles & Tbox is EP90,Oil for gearbox is MTF94 or at a push ATF Dex3 will do,
in regards to fitting a lecky fan,bash on but it will still use the same belt as the current one as you need that pulley :lol: