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Does the 320i have an engine cover?
I have seen this engine cover issue with a Mercedes Diesel, the cover came a little loose and the diesel rattle was more pronounced, when it was put back on properly, the engine sounded much better.
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'05 E90 325i | '06 E90 325i | '08 E90 325i LCI | '13 F30 328i M-Sport | '14 F10 535d M-Sport
Current: '19 G01 X3 M40i  |