Prohibited Fuels; Fuel Additives; Filling The Tank - GMC Cadillac XT4 2019 Owner's Manual

232 DRIVING AND OPERATING
Use unleaded petrol with a posted
octane rating of 95 RON or higher and
with ethanol up to 10% by volume.
Unleaded petrol rated at 91 RON can
be used, but acceleration and fuel
economy will be reduced, and an
audible knocking noise may be heard.
If this occurs, use petrol rated at 95
RON as soon as possible, otherwise
the engine could be damaged. If heavy
knocking is heard when using
unleaded petrol rated at 95 RON, the
engine needs service.

Prohibited Fuels

Caution
Do not use fuels with any of the
following conditions; doing so may
damage the vehicle and void its
warranty:
Fuel with any amount of
methanol, methylal, ferrocene,
and aniline. These fuels can
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.

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. If you
are unable to obtain ACDelco Fuel
System Treatment Plus - Gasoline,
consult your dealer for the GM
approved additive available in your
country.

Filling the Tank

Warning
Fuel vapors and fuel fires burn
violently and can cause injury or
death.
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.