Not sure which 2008 Mercury Mountaineer Performance Chips & Programmers are right for you? We have over 7429 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Here's what some of our customers have said:
"Improved milage but when I had to go back to stock the milage stayed the same . Point is I am not sure if it did anthing . The one thing I will say is it keeps trans in gear loanger before shifting . Overall 3 stars ." —Josh M from Reading, PA bought a Hypertech Max Energy Programmer for a 2008 Mercury Mountaineer, 4.6L V8.