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It sounds like your engines timining chain has signs of failing, and to replace needs taking out the engine. Thats why it took long.
If when you get it back the noise is gone and the engine runs smooth, keep the car, it will be fine.
If there is still noise coming out of the engine (not normal) then trade it for a 2009 (late) or 2010 model.
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Current:
M4 F82 2016 DCT Austin Yellow
530d Msport G30 2017 Bluestone Metallic
Past: F36 430d Gran Coupe M-Sport Alpine White - DMS Remap, E92 320d Crismson Red M-Sport, R56 Mini Cooper S. Mazda RX8 Type-S Japan Import, E46 320ci LCI Convertible M-Sport Silver Grey
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