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The 2007 GMC Yukon requires premium gasoline with a 91 octane rating. While it can technically run on 87 octane fuel, it is not advised because it can harm the engine over time. This vehicle is not compatible with diesel fuel at all. If diesel is accidentally added, do not attempt to start the engine as it will cause it to malfunction. It is important to act quickly in this situation by having the vehicle towed and drained immediately to prevent any damage.
Why does the owner's manual recommend using 87 octane fuel?
Which model of the 2008 Yukon Denali are you looking for?
The Yukon is meant to run on 91 octane gasoline, although it can also run on 87 octane fuel, using the lower octane is not advised.
According to the manual, it suggests using 87. I've followed that recommendation and haven't experienced any issues.
Standard grade of gasoline without added lead.
Diesel is always a reliable choice - you can't go amiss when using it.