NGK and Bosch both are OEM for BMW.However if you get the wrong Bosch plugs you can get all sorts of problems.Never had a problem with NGK plugs :thumbsup I bought some NGK Iridiums for my car and have been running them for over a year now.However they are a bit of overkill and standard NGK will be more than adequate :thumbsup
I've all ways used ngk and they are good value for money to boot
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