Auto Transmission Fluid change

[SpikeyBush]

How often should this be done? Vehicle in question is a 2006 150bhp turbo-diesel Vectra 6 speed automatic. The book is full of rubbish relating to the dealer. I won't let them loose on my lawnmower let alone my jamjar.

Mileage is coming up to 200,000

[TWR]

It's up to the owner, but for that sort of mileage common sense says, replace, also the cam belt if not already done, if that was my car there would be a few other fluid's to change, Brake, Coolant.