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.That’s some bad luck, the early cars with the n47 the chain would snap,but from about 2010 the chain would just get noisy and wouldn’t snap .I had an early 2007 120d and managed 137k before mine went, took it to just under 200k. Then had a 2010 118d and that’s done over 140k serviced by BMW with normal intervals. I do turn off start stop.