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Just came to me... it is because of the JCW tuning kit. Cars with the kit need the plugs replaced sooner.
When my dad got his JCW in 2007, it actually listed on service key reader that it needed new plugs at the first service (15k) but after the first service the car was reprogrammed to say something like 40k or 50k.
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2020 X5 M50i -- Alpine White / Coffee Leather
2020 M550i -- Carbon Black / Beige Leather
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