Review on NGK Iridium Spark Plugs ZFR6FIX-11 (6 PCS) - Brand New by Zack Block

Bought this brand for my 2008 Chevy Silverado and the spark plugs on this listing for my mom's 2003 Jeep Liberty. I've never installed them on a Liberty (it's been on my to-do list for four years), but I've installed this brand on my Silverado. In the four years they've been on my truck, they've driven less than 50,000 miles. It took months to build and I finally got my truck back. Initially the gap was 0.045, and after four years it was 0.09. That's pretty bad wear and tear. I am very disappointed in this brand as it has received such good reviews on Revain. From now on I will be using ACDelco parts for my truck and Mopar for the Liberty.