2.5L 6-Cylinder. Come to the experts! Green Machine! WE WON'T BE BEAT ON PRICE PERIOD! If you've been thirsting for just the right 1999 Mercury Cougar, then stop your search right here. This is the ultimate car that is certain to fit your needs. The precision-tuned 2.5L 6-Cylinder engine provides the very essence of performance, delivering substantial horsepower and torque. BEST PRICE GUARANTEE FROM NON-COMMISSIONED SALES STAFF!!*** Tell us that you saw this vehicle on the Dealix Used Cars Network ***.