Vortec 6.2L V8 SPI VVT and AWD. Come to the experts! All the right ingredients! How exclusive is this! Just in, this outstanding 2012 GMC Yukon XL comes with a Vortec 6.2L V8 SPI VVT engine and AWD. This terrific Yukon XL would look so much better pulling up in your driveway instead of sitting here empty on our lot. Your neighbors might be jealous, but they'll get over it...or maybe not.