Cadillac is the only luxury car brand that can run on regular. If you're racing, go for premium. have been using regular for 9 years on the Northstar. NO PROBLEMS
The 2008 Cadillac CTS runs on regular unleaded.
The 2004 Cadillac CTS runs on regular unleaded.
The 2005 Cadillac CTS runs on regular unleaded.
The 2006 Cadillac CTS runs on regular unleaded.
The 2010 Cadillac CTS runs on regular unleaded.
The 2003 Cadillac CTS runs on regular unleaded.
The 2009 Cadillac CTS runs on regular unleaded.
The 2013 Cadillac CTS runs on regular unleaded.
The 2007 Cadillac CTS runs on regular unleaded.
The 2011 Cadillac CTS runs on regular unleaded.
The 2012 Cadillac CTS runs on regular unleaded.
The 2010 Cadillac CTS-Wagon runs on regular unleaded.