Have questions about this 2018 GMC Yukon XL? TEXT US at 740-203-3131 for quick answers and absolutely no pressure. Priced below KBB Fair Purchase Price! Onyx Black 2018 GMC Yukon XL Denali 4WD EcoTec3 6.2L V8 Chesrown is the ONLY dealer in Ohio that will buy your oil changes and tire rotations for the life of your ownership on ANY vehicle purchase with absolutely no strings attached. This simple benefit can save you thousands in basic maintenance, general wear and tear, and ensure a sterling vehicle history report.