Cadillac CT6
Transmission, start-stop, premium fuel and flex-fuel by model year, 2016–2020
TransmissionThe 2020 Cadillac CT6 uses a 10-speed automatic in every configuration EPA tested.
Auto start-stopYes. Every 2020 Cadillac CT6 configuration EPA tested has auto start-stop.
Premium fuelEPA tested 1 of 2 2020 Cadillac CT6 configurations on premium fuel and the rest on regular gasoline; your owner's manual or fuel-door label is the authority.
Flex-fuel (E85)No. EPA does not list any 2020 Cadillac CT6 configuration as a flex-fuel vehicle (FFV).
2020 at a glance
2 configurations tested by EPA
EPA lists no manual transmission for any Cadillac CT6 from 2016–2020.
Cadillac CT6 features by model year
Configurations by year
2020 Cadillac CT6
2 configurations
| EPA model name | Engine | Transmission | Drive | Start-stop | EPA test fuel | Flex-fuel |
|---|---|---|---|---|---|---|
| CT6 AWD | 3.6L 6-cyl | 10-speed automaticS10 | All-Wheel | Yes | Regular | No |
| CT6 AWD | 4.2L 8-cyl turbo | 10-speed automaticS10 | All-Wheel | Yes | Premium | No |
2019 Cadillac CT6
4 configurations
| EPA model name | Engine | Transmission | Drive | Start-stop | EPA test fuel | Flex-fuel |
|---|---|---|---|---|---|---|
| CT6 | 2.0L 4-cyl turbo | 10-speed automaticS10 | Rear-Wheel | No | Premium | No |
| CT6 AWD | 3.0L 6-cyl turbo | 10-speed automaticS10 | All-Wheel | No | Premium | No |
| CT6 AWD | 3.6L 6-cyl | 10-speed automaticS10 | All-Wheel | Yes | Regular | No |
| CT6 AWD | 4.2L 8-cyl turbo | 10-speed automaticS10 | All-Wheel | Yes | Premium | No |
2018 Cadillac CT6
4 configurations
| EPA model name | Engine | Transmission | Drive | Start-stop | EPA test fuel | Flex-fuel |
|---|---|---|---|---|---|---|
| CT6 | 2.0L 4-cyl turbo | 8-speed automaticS8 | Rear-Wheel | Yes | Premium | No |
| CT6 AWD | 3.0L 6-cyl turbo | 8-speed automaticS8 | All-Wheel | Yes | Premium | No |
| CT6 AWD | 3.6L 6-cyl | 8-speed automaticS8 | All-Wheel | Yes | Regular | No |
| CT6 Plug-In | 2.0L 4-cyl turbo plug-in hybrid | CVT (hybrid eCVT)variable gear ratios | Rear-Wheel | Yes | Premium | No |
2017 Cadillac CT6
4 configurations
| EPA model name | Engine | Transmission | Drive | Start-stop | EPA test fuel | Flex-fuel |
|---|---|---|---|---|---|---|
| CT6 | 2.0L 4-cyl turbo | 8-speed automaticS8 | Rear-Wheel | No | Premium | No |
| CT6 AWD | 3.0L 6-cyl turbo | 8-speed automaticS8 | All-Wheel | No | Premium | No |
| CT6 AWD | 3.6L 6-cyl | 8-speed automaticS8 | All-Wheel | Yes | Regular | No |
| CT6 Plug-In | 2.0L 4-cyl turbo plug-in hybrid | CVT (hybrid eCVT)variable gear ratios | Rear-Wheel | Yes | Premium | No |
2016 Cadillac CT6
3 configurations
| EPA model name | Engine | Transmission | Drive | Start-stop | EPA test fuel | Flex-fuel |
|---|---|---|---|---|---|---|
| CT6 | 2.0L 4-cyl turbo | 8-speed automaticS8 | Rear-Wheel | No | Regular | No |
| CT6 AWD | 3.0L 6-cyl turbo | 8-speed automaticS8 | All-Wheel | No | Premium | No |
| CT6 AWD | 3.6L 6-cyl | 8-speed automaticS8 | All-Wheel | No | Regular | No |
Check before you buy or refuel Confirm on the window sticker, owner's manual or with the dealer. Trims and options can differ from the configurations EPA tested.
About premium fuel EPA data shows the fuel a vehicle was tested on. It does not say whether premium is required or only recommended. Your owner's manual or fuel-door label is the authority.
Before using E85 Confirm the vehicle is a flex-fuel vehicle (FFV) in the owner's manual, or look for a yellow gas cap or an "FFV" badge. Not every version of a model is flex-fuel.
Source: U.S. EPA / Department of Energy vehicle data fromFuelEconomy.gov, data as of September 29, 2026.See how we classify vehicles.
More Cadillac lists
- Cadillac models with a CVT
- Cadillac models without a CVT
- Cadillac models with a manual transmission
- Cadillac models with a conventional automatic transmission
- Cadillac models with auto start-stop
- Cadillac models without auto start-stop
- Cadillac models EPA tested on premium fuel
- Cadillac models that are flex-fuel (E85)