The Yukon XL has great safety records. They can be found on the manufacturers website. Another great source would be to go to the dealership and they will be able to tell you all about the safety ratings.
The 2003 GMC Yukon-XL has 16 valves.
The 2012 GMC Yukon-XL has a V8 engine.
The 2008 GMC Yukon-XL has 16 valves.
The 2010 GMC Yukon-XL has 16 valves.
The 2012 GMC Yukon-XL has 16 valves.
The 2007 GMC Yukon-XL has a V8 engine.
The 2002 GMC Yukon-XL has a V8 engine.
The 2009 GMC Yukon-XL has 16 valves.
The 2002 GMC Yukon-XL has 16 valves.
The 2006 GMC Yukon-XL has 16 valves.
The 2001 GMC Yukon-XL has 16 valves.
The 2008 GMC Yukon-XL has a V8 engine.