I think I'm going to wait until 75k, I'm at 49k now. The original owner was very gentle with the car. I took my car to a shop last week to change out the original plugs and they said mine still look new!
I think when I do them I will probably take a trip out to Auto couture in NJ. They have literally done hundreds of them on e9X's and their price is reasonable.
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2013 e92 M3
2011 X5 35d
2018 F80 M3 ZCP
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