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I’ve had my 2016 340xi M-sport for coming up on 3 years here soon. I’m at 68k and been running the JB4 for about 2 years and 18k miles. I changed the plugs at 50k when I added the JB4 just because, no issues with them at the time. The only other maintenance besides oil changes have been tires, the rear brake pads and cabin air filter. Been an awesome car for me so far.
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