You'll need a 24mm ring spanner to get to the filler plug as there's not enough space to get a socket in there
What oil you planning on using? Remember it needs to be GL4 or GL4/5 but not GL5. Redline MT-90 is widely used & recommended around here. Motul Gear300 & Motylgear 75W90 are other good options as is Amsoil MTG. You'll need 2L.