There model that the number are located at Left side near the engine mounting, but you cannot see it without removing the the engine mounting and it require special tools
The 2014 BMW X5 has an inline 6 engine.
The 2009 BMW X5 has an inline 6 engine.
The 2008 BMW X5 has an inline 6 engine.
The 2010 BMW X5 has an inline 6 engine.
The 2012 BMW X5 has an inline 6 engine.
The 2004 BMW X5 has an inline 6 engine.
The 2001 BMW X5 has an inline 6 engine.
The 2011 BMW X5 has an inline 6 engine.
The 2003 BMW X5 has an inline 6 engine.
The 2013 BMW X5 has an inline 6 engine.
The 2006 BMW X5 has an inline 6 engine.
The 2007 BMW X5 has an inline 6 engine.