I have a 2008 S model and I can easily hear when the engine is low 1/4 quart of oil. I use at least 1 quart per 1000 miles at minimum and have just started logging it. On the last two oil changes I added BG 109 EPR engine flush and the oil was extremely black with carbon. The engine sounded a lot smoother after the flush. My mechanic accuses me of using lower grade gasoline, but I run 91 octane. Perhaps I am not running the engine above the 3500 RPM very much as this may burn off any carbon deposits. The computer fuel mix is suppose to adjust for this so I'm not sure how I have so much carbon build up. I replace the spark plugs as required and I'm surprised how much wear is on them at 30K miles of driving. I have no oil leaks from the engine and I never see smoke coming out of the exhaust pipe when shifting gears. The amount of oil consumption is disturbing and I continuously check and add oil. Perhaps I'll take it if for an emissions test and see how much oil is in the exhaust. I run Castor-oil full synthetic 5W-30 year round.
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MINI Cooper R56 Oil Consumption Diagnosis (2007-2011) | Pelican Parts DIY Maintenance Article