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Yes this is very normal for the 35 engine. Mine does the same thing in both the 335i coupe and my X3. I talked to the dealer about it also and they assured me it is a normal charicteristic of this engine. My understanding is the engine is getting all the fuel and air mixtures calibrated and that is what causes the surging. Nothing to worry about. I hope you are enjoying your X3 as much as I have enjoyed mine for the past 5 months.
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