Originally Posted by AlexTek
The m3 book says that the spark plug change is every 37,000 miles and it is not shown on the CBS.
Did your car showed it in the CBS, you saw it?
It's a change at 37k unless CBS tells them something different. CBS told them to do my car between 42-44k. They said every new BMW except early X3s has CBS so I'm guessing some dealers just bend the rules a little if people are getting plugs at 37k regardless of what CBS is telling them