Originally Posted by FSETH

I just got off the phone with another dealer in the Atlanta area and they confirmed what the first dealer told me. I got a price quote on plugs ($18.99 with the BMWCCA discount by the way) and I asked if the plugs were NGK or Bosch because I would prefer the NGK's. He put me on hold so he could go look at the plugs himself. He came back and said "looks like they are back to Bosch again". NGK wasn't at option at either dealer I called, so I am guessing if you do find NGK at a dealer it is because they haven't run out of them yet. It seems Bosch is the sole manufacturer as far as dealer sourced plugs are concerned.

Just me personally, but unless there are issues, I refuse to change out OE plugs before 80,000 miles or so. Now, if we are talking aftermarket plugs, I would do them at about 40,000.