it could be anything from coil-packs, sparkplugs or even a head gasket. Best thing to do is get the dealership to check for codes and see if anything is coming up (which it should do if it is the coil-packs).
Do you have a check engine light showing? If so, that would indicate an issue that would be logged in the DME. If not, that would indicate a head gasket....
Either way, BMW should be able to carry out the necessary checks to determine the fault.
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Mike R
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