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well it's a 45min job which means that a independent bmw shop will charge you 1hr labor (yes, they always charge you extra) = $100. OEM spark plugs cost about $12 a peace x 6 = $72. Total = $172 + tax so just call it $180 for everything.
now, should you do it at 15K? i wouldn't. is the deal going to? probably not.....Not trying be mr. negative but it probably won't do anything as far as saving you MPGs. you better off changing oil every 5k, using a fuel injection cleaner every 2-3weaks, and keep it between 2-3k rpm between shifts.
an honestly 14 is not that bad.
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