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[stephen orford]

After listening to your engine the sound reminds me of big end bearings that are not getting sufficient oil at the correct pressure. If you continue to drive this car you will, if it is lack of oil at the big ends, damage the engine resulting in a big bill for someone. I would leave the car at the dealers until the problem is rectified. I would also make sure that all of this is recorded and BMW notified in writing. I don't think this engine will have and extended life ! Good luck with the problem please post BMW's diagnosis and cure.