17 21 010 Removing and installing/replacing transmission oil cooler (GS7S47BG SMG): Recycling
WARNING: This page is about a different car, the 2010 BMW M6, 2009 BMW M6, 2008 BMW M6, 2007 BMW M6, and 2006 BMW M6. However, it is still accessible from the selected car via links, so may be relevant.
Catch and dispose of gear oil with suitable equipment.
Observe country-specific waste-disposal regulations.