Not sure which 1999 Mercury Mountaineer Air Filters - Custom Fit is right for you? We have over 14143 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:
"I drive a V8 Mercury Mountaineer. I immediately found a boost in power. Truely it was shocking. Then when I was crusing on the highway, I noticed a bump in my mileage. I know this because I have a computer that tells me my average MPG. It gave me an extra 1.5 MPG on the first trip, and on an 18MPG SUV, that's $$$ in the bank. Thanks..." —Tim F from Santa Rosa, CA bought a K&N Air Filters for a 1999 Mercury Mountaineer.
"Saw a noticable difference in power and especially gas mileage. Got a 16% increase in MPG after the first tank. More expensive but well worth the investment" —Tony B from Boise, ID bought a K&N Air Filters for a 1999 Mercury Mountaineer.