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I have a 2007 325i touring, starting up the engine its quiet but after 5 minutes I get a tapping noise does not affect performance in anyway but is annoying. I have flushed & changed the oil thinking it may be a lifter sticking! took it on a 260 mile drive, tried the revering it at 2500rev for 3min on the flat with no load on the engine to bleed it and it has made no difference at all. dose anyone have any ideas please
 
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