Purchased E3 spark plugs for 2001 Toyota 4Runner 3.4L and separate kit for 2003 Pioneer 4.2LI makes an instant difference noticed in acceleration and improved gas mileage on the highway as I drive constantly. Never had a problem with it and I have to say the 4Runner has a modified motor. If I keep polishing the car it works differently after 2 weeks, by then I clean them and it works like new again. What I really liked is that after a few months of use you realize they don't perform as well as they did when new (obviously) but when snapped on they work like a new set of Delco Iridium AC plugs . since I usually use that in my cars. That being said, in my personal experience they perform much better than any iridium plugs when new and after a few months of use they perform like new iridium plugs, still delivering power and about the same fuel economy. Spark plugs E3.48 I' used Mustangs (great drive but not sure if recommended) and a Dodge 318 5.2 liter engine with a Nissan Tsuru in Mexico in 2001-2007 as I had 4 additional used ones , which I don't need but my buddy wanted to have them. It has worked great on my Tsuru even after using it for 16 months. I would like to mention that I buy new E3 spark plugs every 2 years and clean them every 3 months when changing the oil. What I also like about them is that I can clean them with stainless steel brushes and they work like new again. I tried the same thing with AC Delco Iridium and the spark plugs stopped working causing my engine to stall and say the ignition coil was not working. In my opinion the E3's are great for the efficiency and the fact that I can keep cleaning them to get the best out of them (if I can save money and clean them instead of buying new ones that's great), hopefully that this rating will help
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