This is my 2022 GMC Yukon XL SLE with the awesome 3.0 Duramax Diesel engine and 10 speed transmission. I add some Diesel Exhaust Fluid DEF to the Tank. This Yukon holds 5.4 Gallons of DEF. You can either use the Jugs you buy from the store or the DEF pumps at the Diesel Truck Commercial Fill stations.

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