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2009 328xi. I live in Canada. Had occasional ticking on start up, especially in very cold or humid weather. Ticking goes away once engine is warmed up and you drive off. Tried some oil additive but that didn't work either. For last 3 months (summer) I used high octane 94 (esso here in Canada has it) gas and the ticking has gone away. Once it gets really cold, if the ticking returns I'll put in 89 (mid level) octane and call it a failed experiment.
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