I beg to differ. Garages have a vested interest in advising over-cautious maintenance work. You do have something to lose if such work is carried out badly - or unnecessarily. I have read expert advice that disturbing the innards of, say, the ubiquitous ZF HP 6 box can cause filtered particles to go where they shouldn't - and cause problems soon after the unnecessary oil change. Unless it has been used harshly and arduously, it should last the life of the car. If it works, don't mend it! I would follow the advice of ZF rather than a provincial Audi garage.