2018 Cadillac CT6 Specs
3 powertrain configurations on federal record for the 2018 Cadillac CT6: 3.0L 6-cyl Premium Gasoline; 3.6L 6-cyl Regular Gasoline; 2.0L 4-cyl Premium Gasoline, in All-Wheel Drive and Rear-Wheel Drive, rated up to 25 MPG combined by the EPA.
Source: EPA federal records (fueleconomy.gov) · Updated 2026-10-26 · By CarWhere Research
| Engine | Transmission | Drivetrain | City | Highway | Combined |
|---|---|---|---|---|---|
| 3.0L 6-cyl Premium Gasoline | Automatic (S8) | All-Wheel Drive | 18 | 26 | 21 |
| 3.6L 6-cyl Regular Gasoline | Automatic (S8) | All-Wheel Drive | 18 | 27 | 21 |
| 2.0L 4-cyl Premium Gasoline | Automatic (S8) | Rear-Wheel Drive | 22 | 30 | 25 |
CT6 by year
Buying a used CT6? Specs are the easy half.
then check the specific car: the Full VIN Report shows that VIN's factory build, recall record, and market history before you pay for it.
Frequently asked questions
What engines does the 2018 Cadillac CT6 have?
3 engines on federal record: 3.0L 6-cyl Premium Gasoline; 3.6L 6-cyl Regular Gasoline; 2.0L 4-cyl Premium Gasoline, offered with Automatic (S8) and All-Wheel Drive or Rear-Wheel Drive. The full per-configuration table is above.
What gas mileage does the 2018 Cadillac CT6 get?
EPA combined ratings run 21–25 MPG depending on configuration — the table above shows city/highway/combined for each engine, transmission, and drivetrain.
How do I get the specs for my exact VIN?
These are the federal-record configurations for the 2018 Cadillac CT6 overall. For one specific vehicle — its exact engine, trim, factory options, and original window sticker — decode the 17-character VIN free at carwhere.com/tools/vin-decoder.
Where does this data come from?
The U.S. EPA's public vehicle dataset (fueleconomy.gov) — the federal record of every US-market configuration since 1984 — refreshed 2026-10-26. Public-domain data; republish with attribution to CarWhere (carwhere.com).