Quote:
Originally Posted by nachob
I have changed on other BMW's between NGK and Bosch and have experienced some issues. The last time was putting Bosch equivalent plugs in my 330i that came with NGK. Idle deteriorated and this was confirmed by my best friend that runs an independent BMW Mercedes shop. He has stopped interchanging plugs. It's easy to do but still some work so I would strongly recommend you get BMW or Bosch equivalent plugs on a stock 1M. These cars are picky and 1M came with Bosch as far as I know.
2 cents
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Problem for me, the dealership has both NGK and Bosch ones for sale at more/less the same price.