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A BMW Service Manager also told me that the gearbox oil can and probably should be changed but only if the car is expected to go on for 1,000,000s of miles.
I also read that the method that BMW use to change the oil and the method that gearbox specialists use differs in that BMW don't completely flush through the new oil but simply drain and top up. (Something like that!) Also remember seeing a figure of 11 litres, I think this was the figure needed for a complete flush through?
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