The size of engine depends on the model, some had the 6 cylinder 2.5 or 2.7 liter and some had the four cylinder 1.8 liter motor.
The 2006 BMW 7-Series has a V8 engine.
The 2010 BMW 6-Series has a V8 engine.
The 2010 BMW 7-Series has a V8 engine.
The 2007 BMW 7-Series has a V8 engine.
The 2008 BMW 6-Series has a V8 engine.
The 2007 BMW 6-Series has a V8 engine.
The 2003 BMW 7-Series has a V8 engine.
The 2002 BMW 7-Series has a V8 engine.
The 2004 BMW 6-Series has a V8 engine.
The 2009 BMW 7-Series has a V8 engine.
The 2005 BMW 6-Series has a V8 engine.
The 2006 BMW 6-Series has a V8 engine.