3.5L V6 SFI. The Valley Buick GMC EDGE! Won't last long! If you demand the best, this terrific 2007 Pontiac G6 is the car for you. It scored the top rating in the IIHS frontal offset test. New Car Test Drive called it ...a roomy car that offers good road manners and excellent overall function... This G6 will save you money by keeping you on the road and out of the mechanic's garage.