hi and welcome unionjak
sorry for not saying hi earlier...things have been busy

I run a 300tdi 110 defender and a u900 unimog. as NJC has said older mogs suffer from being stood around and seals going. The only real problems from the mog has been due to fuel problems (and the fact i was given dirty diesel from a friend

) and pto problems from the person i got the shafts from. As double gloucester has said at least the military mogs dont have these problms as they are a 'basic' mog. Oh and just to add my mog has broken down more than my defender has. The defender is ex-utility so has had all its services and any parts replaced, no questions asked but the utility company.
as for the speed an u900 will do 45mph flat out but a square cab (like the 1300) are slightly quicker about 55mph (someone correct me if im wrong please
cheers casto