I always thought it was hilarious that people with engines that were largely aluminum alloy construction were buying magnetic drain plugs. Sure, the crankshaft is steel, but how many people have had to buy a crankshaft due to chunks falling off of it?

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue