I wrote Mike Miller of Bimmer Mag...might be useful...
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I just placed my order for a 2011 E90 M3 and plan to make this car a keeper. I've only ordered 1 option to minimize future problems and expenses. That option is the M-DCT due to the requirement for my wife to drive it.
I've heard that the 1,200 mile break in service does not include changing the fluid in the M-DCT gearbox. Is there any value in doing a break in fluid change with the M-DCT? If there is any value in doing a break-in service on the M-DCT, is there any special procedure?
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You only selected one option, but that option is the one most likely to maximize future problems and expenses. This is always the case with any BMW transmission that is not the simple basic manual gearbox.
The M-DCT is more automatic transmission than manual gearbox and I really don't know whether it would benefit from a 1,200-mile break-in service. Here is what I do know: Automatics don't benefit from a 1,200-mile break-in service. The M-DCT transmission requires a special hydraulic oil, only available from BMW, that is incredibly expensive and difficult to change. And the BMW dealer will probably fight you tooth and nail if you try to get them to change it ever, much less at 1,200 miles.
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