Originally Posted by signes
Not from BMW's perspective, that was the whole point of my posts. The manual states one thing but BMW treats it as "CBS" based on when the car calls for it. Mine were replaced at 28k, not 37.
mine was replaced per CBS.... it said it is now due when it was 28k... not 37...
although i added 40k miles after that before replacing with new Sparkplug this past weekend. Spark plug looks ok all were in great shape.. but then again after replacing it with new plugs it was night and day difference. maybe its because i replaced it after 40k.. i dont know..
I suggest replacing it every 30k just to make sure.