Yes, a Cadillac CTS can use 87 octane gas, particularly the models equipped with the V6 engine. However, for optimal performance and fuel efficiency, it is recommended to use premium gasoline with an octane rating of 91 or higher, especially for models with the V8 engine. Always refer to the owner's manual for specific fuel recommendations based on your model year and engine type.
The 3.6 engine can take regular (89 octane)
Best but is to read the user manual which states 89 octane
Either engine on the 05 CTS runs on 87 Octane gas. The 05 CTS-V runs on premium only.
Premium
Cadillac recommends premium fuel in this engine.
If you are refering to regular gas, it's not recommended. Some people use it as well as myself due to the fact of gas prices. What I do is add a gas octane boost to compansate for the lower octane fuel.
The 2009 Cadillac CTS runs on regular unleaded.
The 2010 Cadillac CTS runs on regular unleaded.
The 2003 Cadillac CTS runs on regular unleaded.
The 2005 Cadillac CTS runs on regular unleaded.
The 2008 Cadillac CTS runs on regular unleaded.
The 2013 Cadillac CTS runs on regular unleaded.