Hi 2 types of gearbox for micra,s one you fill through the speedo undo it take it out of the back of the gearbox near the bulk head and it,ll be marked low and high or on the front of the gearbox facing towards the front bumper there will be a plug which will take a 1/2" drive or 3/8" drive ratchet square head undo this then fill till you,ve got a slow trickle coming out the hole.Do this with the engine off in neutral, i would recommend engine oil 15/40 or 10/40 either will be fine as gear oil,ie ep80/90 is too thick for the baulk rings to cope with so it might crunch going into gear.
Any more help i can be e-mail me i,d be glad to help.
Richard
rbtrans@hotmail.com
Richard
November 2005