I have a 5 cylinder D3 D5204T2 engine. Well there are some minor issues but nothing too scary. First of all the aux belt can snap because the tensioner pulley is too strong, so when replacing the tensioner replace the belt too. Then the fuel pumps on 2010/2011 D3 engines are built very poorly so they eventually start to fail, which is very noticeable when you start experiencing decreased engine performance. You start noticing that right after a finished regen cycle, then after a few thousands of miles they die completely. You should also keep an eye on your radiator fan as they're prone to failure.
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