Does 2024 Cadillac Ct5 Require Premium Gas Fuel Tank. Recommended fuel (lsy 2.0l l4 engine) premium unleaded gasoline meeting astm specification d4814 with a posted octane rating of 93 — (r+m)/2 — is highly recommended for best performance and fuel economy. The manual for a 2017 xt5 on page 236 says 'if equipped, the fuel door is locked when the vehicle doors are locked'.

On the other hand, if not then use whichever grade. Most cars that require premium say that if you use regular, it’s ok, but you will have reduced performance.