One problem related to engine rattling and whining sounds has been reported for the 2009 Mini Cooper. The most recently reported issues are listed below.
Just purchased used 09 Mini , 2nd owner, on start up car sounded rough, dieseling sound and was told by dealer that it was common. Then when driving at low speeds or when slowing down, terrible rattle sound. Took it in for an oil change, and the rattle went away, but then came back shortly before next oil change was due. Took it in for oil change again, and sound went away again, but then came back within days. Finally was able to get an appt with the closest authorized dealer, 50 miles away, but couldn't get in for two weeks in order to get a loaner. They had it for two days, replaced the timing chain, nylon parts were in the oil pan from the guides being shredded. Picked up the car on the third day, and fir almost one week it seemed fine. Just short of one week out of the shop and heard the rattle again. But then it was fine, so I thought it was an anomaly. One week to the day since picking it up from the repair, barely made it into the drive from taking my daughter to school. Called the shop and have it scheduled to go back in. Having the car towed to the shop as the repair tech treks me that it is "unsafe to drive. ".