Quote:
Originally Posted by stormchaser7
Plugs are relatively easy to change out. Just follow the DIY. Longest part is removing the plastic cowl in the rear of the engine compartment to access the removal bolts on the engine cover. NKG plugs are another option but usually recommended if you tune the car for added HP. Definitely purchase the thin walled socket before tackling this job. Most auto parts stores don't stock them. Online ordering is your best bet.
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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