I have a stock 2014 BMW X3 35I M Sport Pkg. and purchased these plugs before reading all of the posts/recommendations, which indicate that these plugs are not designed for my stock N55 engine, which stinks because it appears that I will now need to replace them. With that said, I understand you recommend a re-gap to 0.56mm (0.022"), but if you don't and leave them as the stock gap, are there any advantages or disadvantages to that? Also, will I notice a change if I replace these with an approved plug? The car appears to operate well, but am I sacrificing efficiency, performance, or long-term repercussions by using this plug instead of the recommended one?
Thank you.
Thank you!
While it may be running well, you may eventually run into issues with misfires and loss of power. More so the plugs could foul early and reduce fuel economy. Would recommend removing and gapping them properly