As you can see from my reply to Snowball there are a lot of people out there paying way over the odds for their servicing because they are under the mistaken belief that they HAVE to have their car serviced by the dealer.
Sorry, hometune, but my car manufacturer's service and maintenance contract specifically states that it must be serviced by a dedicated garage ( which I believe equates to 'authorised') to to maitain the validity of the warranty. The monthly payment goes direct from my account to the car manufacturer, and in return the manufacturer accepts responsibility for upkeep of the car. It is obvious that the manufacturer has a legal right to ensure that the car is maintained using genuine parts, and that anyone carrying out the maintenance work is manufacturer-trained for that vehicle. Just think about it.
If you sold a product and offered a warranty on it, would you be prepared to accept responsibity for any Joe Bloggs the owner of that product might employ to service it? Not if you wanted to stay in business, and i think you will find that the legal implications take that into account.
Since the cost is a fixed payment, there would be no point in taking the vehicle to a garage other than an authorised one. Yes, I do have a choice if I want a cheaper service; I then choose my garage and the manufacturer chooses not to offer a service warranty.
What I do agree with is this. When you buy a car, you do have the right to choose your servicing garage. But, in the event of an issue arising whilst the car is under warranty, if you have used a garage not trained on that vehicle, and they have used non-OE parts, AND can satisfy a court of law that these two factors have resulted in a situation far more costly than it would otherwise have been, then you pick up the tab.
Any warranty work that is paid for by the manufacturer automatically entitles him to decide where the parts are sourced, and who does the work. He is paying for it; you are not.
Face the obvious: If you took your car to the accredited dealership, and they fitted non-OE parts which later failed, what would your reaction be? Play merry Hell, or shrug it off and move on?