gearbox oil?
 

As above.. My gearbox oil seems a little low so was wondering which oil i should use in my98 terzo as i've never had to change or top this up, and should i change all oil or just top up as i don't know when it was last changed, all advise welcome :-)

should be changed every 2-3yrs depending on use, etc.........

personal choice would be crx75w90NT

Ok think i'll change the whole lot then, Many thanks for yr advise :-)