2019 CADILLAC CT6 octane

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-12533370) -
2019 - crc - 1/23/19
IN BRIEF 25
andiilluminate in the
instrument cluster. The
appropriate DIC message displays.
. Press and release
Yagain to turn
on both systems.
See Traction Control/Electronic Stability
Control 0220.
The vehicle has Driver Mode Control.
See Driver Mode Control 0222.
Tire Pressure Monitor
This vehicle may have a Tire Pressure
Monitor System (TPMS).
The low tire pressure warning light
alerts to a significant loss in pressure
of one of the vehicle's tires. If the
warning light comes on, stop as soon
as possible and inflate the tires to the
recommended pressure shown on the
Tire and Loading Information label. See
Vehicle Load Limits 0197. The
warning light will remain on until the
tire pressure is corrected.
The low tire pressure warning light
may come on in cool weather when
the vehicle is first started, and then
turn off as the vehicle is driven. This
may be an early indicator that the tire
pressures are getting low and the tires
need to be inflated to the proper
pressure.
The TPMS does not replace normal
monthly tire maintenance. Maintain
the correct tire pressures.
See Tire Pressure Monitor System
0 348.
Tire Fill Alert (If Equipped)
This feature provides visual and
audible alerts outside the vehicle to
help when inflating an underinflated
tire to the recommended cold tire
pressure. See “Tire Fill Alert (If
Equipped)” underTire Pressure Monitor
Operation 0349.
Fuel (2.0L L4 Turbo Engine)
Premium Recommended
Use premium 93 octane —(R+M)/2 —
unleaded gasoline in your vehicle. TOP
TIER Detergent Gasoline is
recommended. Unleaded gasoline with
an octane rating as low as 87 may be
used, but it will reduce performance
and fuel economy. See Recommended
Fuel (2.0L L4 Turbo Engine) 0277 or
Recommended Fuel (3.0L Twin Turbo
V6 and 4.2L Twin Turbo V8 Engines)
0 277 or
Recommended Fuel (3.6L V6 Engine)
0 277.

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-12533370) -
2019 - crc - 1/23/19
26 IN BRIEF
Fuel (3.0L Twin Turbo
V6 and 4.2L Twin Turbo
V8 Engines)
Premium Required
Use premium 93 octane—(R+M)/2 —
unleaded gasoline in your vehicle. TOP
TIER Detergent Gasoline is
recommended. Unleaded gasoline with
a 91 octane rating may be used, but it
will reduce performance and fuel
economy. See Recommended Fuel (2.0L
L4 Turbo Engine) 0277 or
Recommended Fuel (3.0L Twin Turbo
V6 and 4.2L Twin Turbo V8 Engines)
0 277 or
Recommended Fuel (3.6L V6 Engine)
0 277.
Fuel (3.6L V6 Engine)
Regular Unleaded Fuel
Use only Regular 87 octane —(R+M)/
2 — or higher unleaded gasoline in
your vehicle. TOP TIER Detergent
Gasoline is recommended. Do not use
gasoline with an octane rating lower
as it will result in reduced
performance and lower fuel economy.
See Recommended Fuel (2.0L L4 Turbo
Engine) 0277 or
Recommended Fuel (3.0L Twin Turbo
V6 and 4.2L Twin Turbo V8 Engines)
0 277 or
Recommended Fuel (3.6L V6 Engine)
0 277.
E85 or FlexFuel
No E85 or FlexFuel
Gasoline-ethanol fuel blends greater
than E15 (15% ethanol by volume),
such as E85, cannot be used in this
vehicle.
Engine Oil Life System
The engine oil life system calculates
engine oil life based on vehicle use
and displays the CHANGE ENGINE
OIL SOON message when it is time to
change the engine oil and filter. The
oil life system should be reset to 100%
only following an oil change.
Resetting the Oil Life System
1. Using the DIC buttons, display REMAINING OIL LIFE on the
DIC. See Driver Information Center
(DIC) 0150.

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-12533370) -
2019 - crc - 1/23/19
DRIVING AND OPERATING 277
Recommended Fuel (2.0L
L4 Turbo Engine)
Do not use any fuel labeled E85 or
FlexFuel. Do not use gasoline with
ethanol levels greater than 15% by
volume.
Premium unleaded gasoline meeting
ASTM specification D4814 with a
posted octane rating of 93 is highly
recommended for best performance
and fuel economy. Unleaded gasoline
with an octane rated as low as 87 can
be used. Using unleaded gasoline
rated below 93 octane, however, will
lead to reduced acceleration and fuel
economy. If knocking occurs, use a
gasoline rated at 93 octane as soon as
possible, otherwise, the engine could
be damaged. If heavy knocking is
heard when using gasoline with a
93 octane rating, the engine needs
service.
Recommended Fuel (3.0L
Twin Turbo V6 and 4.2L
Twin Turbo V8 Engines)
Do not use any fuel labeled E85 or
FlexFuel. Do not use gasoline with
ethanol levels greater than 15% by
volume.
Use premium unleaded gasoline
meeting ASTM specification D4814
with a posted octane rating of 93.
If unavailable, unleaded gasoline with
a posted octane rating of 91 may be
used, but with reduced performance
and fuel economy. If the octane is less
than 91, the engine could be damaged
and the repairs would not be covered
by the vehicle warranty. If heavy
knocking is heard when using gasoline
rated at 93 octane, the engine needs
service.
Recommended Fuel (3.6L
V6 Engine)
Do not use any fuel labeled E85 or
FlexFuel. Do not use gasoline with
ethanol levels greater than 15% by
volume.Use regular unleaded gasoline meeting
ASTM specification D4814 with a
posted octane rating of 87 or higher.
Do not use gasoline with a posted
octane rating of less than 87, as this
may cause engine knock and will
lower fuel economy.
Prohibited Fuels
Caution
Do not use fuels with any of the
following conditions; doing so may
damage the vehicle and void its
warranty:
. For vehicles that are not
FlexFuel, fuel labeled greater
than 15% ethanol by volume,
such as mid-level ethanol
blends (16–50% ethanol), E85,
or FlexFuel.
. Fuel with any amount of
methanol, methylal, ferrocene,
and aniline. These fuels can
(Continued)

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-12533370) -
2019 - crc - 1/23/19
278 DRIVING AND OPERATING
Caution (Continued)
corrode metal fuel system
parts or damage plastic and
rubber parts.
. Fuel containing metals such
as methylcyclopentadienyl
manganese tricarbonyl
(MMT), which can damage
the emissions control system
and spark plugs.
. Fuel with a posted octane
rating of less than the
recommended fuel. Using this
fuel will lower fuel economy
and performance, and may
decrease the life of the
emissions catalyst.
Fuels in Foreign Countries
The U.S., Canada, and Mexico post
fuel octane ratings in anti-knock index
(AKI). For fuel not to use in a foreign
country, see Prohibited Fuels 0277.
Fuel Additives
TOP TIER Detergent Gasoline is highly
recommended for use with your
vehicle. If your country does not have
TOP TIER Detergent Gasoline, add
ACDelco Fuel System Treatment Plus
−Gasoline to the vehicle’s gasoline fuel
tank at every oil change or 15,000 km
(9,000 mi), whichever occurs first. TOP
TIER Detergent Gasoline and ACDelco
Fuel System Treatment Plus−Gasoline
will help keep your vehicle’s engine
fuel deposit free and performing
optimally.
Filling the Tank
{Warning
Fuel vapors and fuel fires burn
violently and can cause injury or
death.
(Continued)
Warning (Continued)
Follow these guidelines:
. To help avoid injuries to you
and others, read and follow
all the instructions on the
fuel pump island.
. Turn off the engine when
refueling.
. Keep sparks, flames, and
smoking materials away
from fuel.
. Do not leave the fuel pump
unattended.
. Avoid using electronic devices
while refueling.
. Do not reenter the vehicle
while pumping fuel.
. Keep children away from the
fuel pump and never let
children pump fuel.
(Continued)

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-12533370) -
2019 - crc - 1/23/19
280 DRIVING AND OPERATING
2. Insert and latch the funnel intothe capless fuel system.
{Warning
Attempting to refuel without using
the funnel adapter may cause fuel
spillage and damage the capless
fuel system. This could cause a fire
and you or others could be badly
burned and the vehicle could be
damaged.
3. Remove and clean the funnel adapter and return to the storage
location.
Filling a Portable Fuel
Container
{Warning
Never fill a portable fuel container
while it is in the vehicle. Static
electricity discharge from the
container can ignite the fuel vapor.
(Continued)
Warning (Continued)
You can be badly burned and the
vehicle damaged if this occurs. To
help avoid injury to you and others:
. Dispense fuel only into
approved containers.
. Do not fill a container while
it is inside a vehicle, in a
vehicle's trunk, pickup bed,
or on any surface other than
the ground.
. Bring the fill nozzle in
contact with the inside of the
fill opening before operating
the nozzle. Contact should be
maintained until the filling is
complete.
. Do not smoke while
pumping fuel.
. Avoid using electronic
devices.
Trailer Towing
General Towing
Information
Only use towing equipment that has
been designed for the vehicle. Contact
your dealer or trailering dealer for
assistance with preparing the vehicle
to tow a trailer. Read the entire
section before towing a trailer.
To tow a disabled vehicle, see Towing
the Vehicle 0370. To tow the vehicle
behind another vehicle such as a
motor home, see Recreational Vehicle
Towing 0372.
When towing with the 2.0L L4 engine,
only use unleaded gasoline with an
octane rating of 89 or higher. Using
gasoline with a lower octane rating
while towing may damage the engine
and may not be covered by the vehicle
warranty. See Recommended Fuel (2.0L
L4 Turbo Engine) 0277 or
Recommended Fuel (3.0L Twin Turbo
V6 and 4.2L Twin Turbo V8 Engines)
0 277 or
Recommended Fuel (3.6L V6 Engine)
0 277.