33 21... Ribbed teeth

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2013 BMW 128i, 2012 BMW 128i, 2011 BMW 128i, 2010 BMW 128i, and 2009 BMW 128i. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Bolts with ribbed teeth must be replaced after they have been released!

Fig 1: Identifying Ribbed Teeth

Courtesy of BMW OF NORTH AMERICA, INC.