This is the rear engine seal also known as the rear main seal. It is often a good idea to preventatively replace this seal any time it is exposed, like when replacing the clutch or disconnecting the transmission from the engine.
This item fits the following BMWs: 2004-2010 E60 BMW 545i 550i 2004-2011 E63 BMW 645ci 650i 2002-2008 E65 BMW 745i 745li 750i 750li 760i 760li 2002-2008 E65 BMW 745i 745li 750i 750li 760i 760li 2004-2006 E53 BMW X5 4.4i X5 4.8is 2007-2013 E70 BMW X5 4.8i X5 xDrive48i Show More Show Less