Compatible with following models for Buick :
Century Custom 3.1L 2005 2004 2003 2002 2001
Century Limited 3.1L 2005 2004 2002 2001
Century Special 3.1L 2005
LaCrosse CX 3.8L 2008 2007 2006 2005
LaCrosse CXL 3.8L 2008 2007 2006 2005
LaCrosse CXS 3.8L 2008 2007 2006 2005
LaCrosse Super 5.3L 2008
Regal GS 3.8L 2004 2003 2002 2001
Regal LS 3.8L 2004 2003 2002 2001
Rendezvous CX 3.4L 2003 2004 2005
Rendezvous CX 3.5L 2007 2006
Rendezvous CX 3.6L 2006
Rendezvous CXL 3.4L 2003 2004 2005
Rendezvous CXL 3.5L 2007 2006
Rendezvous CXL 3.6L 2004 2005 2006
Rendezvous Ultra 3.6L 2004 2005
Terraza CX 3.5L 2005 2006
Terraza CX 3.9L 2007 2006
Terraza CXL 3.5L 2005 2006
Terraza CXL 3.9L 2007 2006

Compatible with following models for Cadillac?
CTS Base 2.8L 2005 2006 2007
CTS Base 3.2L 2003 2004
CTS Base 3.6L 2004 2005 2006 2007 2008
CTS Luxury 3.2L 2003
CTS Luxury 3.6L 2008
CTS Premium 3.6L 2008
CTS V Sedan 5.7L 2004 2005
CTS V Sedan 6.0L 2006 2007
DeVille Base 4.6L 2000 2001 2002 2003 2004 2005
DeVille DHS 4.6L 2000 2001 2002 2003 2004 2005
DeVille DTS 4.6L 2000 2001 2002 2003 2004 2005
DeVille STS 4.6L 2001
Seville SLS 4.6L 2000 2001 2002 2003 2004
Seville STS 4.6L 2000 2001 2002 2003 2004
SRX Base 3.6L 2004 2005 2006 2007 2008
SRX Base 4.6L 2004 2005 2006 2007 2008
SRX Confort 3.6L 2004 2005 2006
SRX Elegance 3.6L 2004 2005 2006