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Long overdue task for me, but there you go, the US version of WDS (BMW Wiring Diagrams), up to 2007, is now available for US models.
Enjoy
http://www.bmw-planet.com/diagrams/
BMW CIC technical information for 2008+ cars
Download link (2MB)
Here is a bulletin released by NGK in 2007 explaining why anti-seize must not be used on metal plated sparks.
NGK bulletin: NGKSP-0907-1
Download link (150kb)
Handy DIY here, but still, this requires some experience and electronic knowledge. You have been warned.
Download link (9mb)


