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How often do you guys change these? I'm changing the plugs (or trying to) in my 06 5.4 now and I was just thinking about putting the same ones back on since I haven't had any issues with them.
My opinion, dont fix whats not broke. You will know if one goes bad through a misfire....
Remember the lifetime warranty is only as good as the company offering it. If they don't sell that particular item number anymore or if they are out of business, you're SOL.