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Cadillac XT4 Owner Manual (GMNA-Localizing-MidEast-14584650) - 2021 -
CRC - 7/15/20
254
DRIVING AND OPERATING
are temporarily unavailable. This
message could be due to a blocked
camera. The LKA system does not
need service. Clean the outside of the
windshield behind the rearview mirror.
LKA assistance and/or LDW alerts
may occur due to tar marks, shadows,
cracks in the road, temporary or
construction lane markings, or other
road imperfections. This is normal
system operation; the vehicle does not
need service. Turn LKA off if these
conditions continue.
Fuel
Top Tier Fuel
GM recommends the use of TOP TIER
Detergent Gasoline to keep the engine
clean, reduce engine deposits, and
maintain optimal vehicle performance.
Look for the TOP TIER Logo or see
www.toptiergas.com for a list of TOP
TIER Detergent Gasoline marketers
and applicable countries.
Recommended Fuel
Unleaded petrol with a posted octane
rating of 95 RON or greater and with
ethanol up to 10% by volume is
recommended. If unavailable,
unleaded petrol rated at 91 RON can
be used, but will result in reduced
performance and driveability, and an
audible knocking noise may be heard.
Once available, 95 RON petrol or
greater should continue to be used.
If heavy knocking is heard when using
unleaded petrol rated at 95 RON or
greater, 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
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
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