Two problems related to engine oil leaking have been reported for the 2009 Mini Cooper S Clubman. The most recently reported issues are listed below.
Turbo oil line leak, dealer wants $3300 to repair.
Car rattling and sounding like a diesel for over a year. Dealer service advised to check oil and be sure oil level was proper. November 2011, all oil leaked out of car onto garage floor. Car towed to dealer service. They explained oil leaked because a "plug" had come loose. Dealer replaced sealing ring and adjusted the chain. I expressed concern about the engine and requested a diagnostic be done. Service manager replied the car was already put together and I would need to make another appointment. Car continued to rattle loudly. Made another appointment December 2011 after researching online and finding a known problem with tensor chain. I informed dealer that I expected the chain to be replaced and a complete engine diagnostic. Dealer replaced tensor chain. Car continues to rattle intermittently. Oil is checked twice per week and kept at proper level.