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I can tell you doing it with BMW garage will cost you more, in my case it was following driving over a metal object that left a hole in my gearbox oil tray (oil sump), the oil on it owns was 550 Euros around 430 sterling the auto box need 9 litres, my insurance covered the costs, so kind of a service in one way be it at lower mileage 55000 miles.
I know there is a debate about the type of oil used as it is the main cost factor, and a tread exist in this forum on how ZF recommendations are different to the one from BMW, hence maybe why the price you quoted is less, ZF recommendations for service intervals are shorter than the one by BMW, we talking of a considerable difference, so maybe why ZF can afford to go for cheaper oil, I believe BMW goes as far as saying the new auto gear box does not need a service in the life time of the vehicle, you find a good article on the matter by BMW Car magazine opting to go the ZF way i.e. recommend the service.
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