If you use the Super Magnetic Oil Drain Plug on your 2002-2006 R50 Cooper and R53 Cooper S Hatchback, and the 2005-2008 R52 Cooper and Cooper S Convertible, here is the replacement Crush Washer.
Unlike the aluminum washers provided with the Magnetic Drain Plug, these are true one-time-use copper 'crush washers'.
Remember to use Full Synthetic motor oil!
Torque oil filter cannister to 25Nm or 18 lb-ft, and drain plug to 25Nm or 18 lb-ft.
NOTE: Not for use with the factory drain plug which had a molded plastic crush washer attached to the drain plug. See NME1052 for the factory drain plug.