Sorry, but SEARCH isn't working on my tablet and my laptop crapped the bed...
At what mileage are you guys replacing plugs? I replaced my factory plugs with another set of Denso on my 2008 4.0L, non-modded except CAI, at about 90,000 despite that they still looked good. I have 180,000 and other than my fuel mileage down a tad ( and I suspect not plug related) she runs like a top. I have a fresh set of Denso's but I'm wondering if I should just hold off. At 65 yo, you have to consider reducing the necessary workload...