GMC Yukon 2025 - Top Tier Fuel; Recommended Fuel (5.3 L Engine); Recommended Fuel (6.2 L Engine)

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-17942154) - 2025
Driving and Operating 279
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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 (5.3L Engine)
Fo
r diesel engine vehicles, see “Fuel for Diesel
Engines” in the Duramax diesel supplement.
Regular unleaded gasoline meeting ASTM
sp
ecification D4814 with a posted octane rating
(R+M)/2 of 87 or greater is recommended.
Do not use gasoline with aposted octane
rating of less than 87, as this will result in
reduced performance and driveability. If heavy
k
nocking is heard when using gasoline rated at
87 or greater, the engine needs service.
Do not use any fuel labeled E85 or FlexFuel.
Do not use gasoline with ethanol levels greater
than 15% by volume.
Recommended Fuel (6.2L Engine)
For diesel engine vehicles, see “Fuel for Diesel
Engines” in the Duramax diesel supplement.
Premium unleaded gasoline meeting ASTM
sp
ecification D4814 with a posted octane rating
(R+M)/2 of 91 or greater is recommended. If
unavailable, unleaded gasoline with aposted
octane rating of 87 may be used, but will result
in reduced performance and driveability. If
heavy knocking is heard when using gasoline
rated at 91 or greater, the engine needs service.
Do not use any fuel labeled E85 or FlexFuel.
Do not use gasoline with ethanol levels greater
than 15% by volume.