I put these on my 2006 Jeep Grand Cherokee Laredo 3.7L V6. These plugs were easy to install and not properly spaced. They deviate only slightly from the specification. My other spark plugs were still good but I had some rubber coil innards that had melted on the spark plugs and thought I should change the spark plugs just to be safe but so far so good and I'll post after I do I drove a few good kilometers with these plugs.
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