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Madness Motorworks
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BMW 650 N62  it has a common problem where black smoke comes out of the exhaust and it is caused by the valve stem seals breaking down and leaking. At your local dealer this is a $9200 job, we are doing a special where we do the whole job for $4500.
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Valve Stem Seals
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BMW has issued a recall due to faulty air bag sensors in the passenger seat.

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Most engines these days are direct injection, this gives vehicles more power but also makes them more fuel efficient. The disadvantage of this engine design is that the intake valves are no longer in the path of the detergent rich fuel and only in contact with air or rather blowby gases from the crankcase breathing circuit, in which substantial quantities of fuel and oil can be found. This will lead to deposits of carbonised fuel and oil in the intake tract as well as on the intake valves themselves.

Carbonization of the valves can cause them not close properly anymore. You may notice performance degradation, engine knocking, a bumpy idle, vibrations and diminished throttle response, you may also notice an increase in your oil consumption.

The best method for cleaning the intake valves is walnut shell blasting which uses walnut shells ground to between .45 and .80mm or SAE20/30. Walnut blasting is just like sand blasting but uses walnut shells which as organic soft abrasives will not damage the intake valve, valve guide, or intake port. This same process is used to clean aircraft engines, delicate electrical circuit boards, and has been around since the late 1800's.

We recommend for most cars to do the cleaning at around 30,000 to 40,000 miles but as you can see from the pictures below some engines can have carbon build up as early as 25,000 miles.
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10/2/14
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LPT: There is a TSB for R55, R56 & R57, SI M 11 02 08. You can hear a knocking noise from the engine compartment, the noise will be considerably louder when the engine hood is open. MINI (BMW) consider this noise to be a normal characteristic of the pump and their TSB says not to replace. Please keep an ear and eye out for the pump issue as we have had two customers with this issue just this month and one failed causing the cam shaft to break damaging valves and the timing chain. 
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Working on this beast
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9/11/14
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Modded MINI in the shop today!
http://imgur.com/a/s7ZXB

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Here is our shop MINI, she has been fully modded in and out. 
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9/2/14
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