Notes on threaded connections with aluminum screws/bolts - AH00.00-P-0006-01RM
WARNING: This page is about a different car, the 2012 Mercedes-Benz C300, 2011 Mercedes-Benz C300, 2010 Mercedes-Benz C300, 2009 Mercedes-Benz C300, and 2008 Mercedes-Benz C300. However, it is still accessible from the selected car via links, so may be relevant.
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For bolted connections with aluminum bolts, the aluminum bolts must always be replaced once they have been used. However, before new aluminum bolts are screwed in, the mating thread has to be cleaned thoroughly.
Otherwise, the threaded connection may be released or work its way loose unintentionally.
When releasing bolted connections with aluminum bolts the sudden loosening torque may present a risk of injury.