888-656-7577 Chief among the key changes this year for the 2015 Lincoln Navigator is a turbocharged V6 engine that promises both stronger performance and better fuel economy than the anemic and old-tech V8 it replaces. Front-end styling adopts Lincoln's "split wing" grille, the rear gets a full-width taillight and an illuminated "welcome mat" lights up under both front doors when they're unlocked. Hidden from view is a newly optional suspension with adjustable dampers that promise greater comfort and stability when you need it.