Yeah I've had these on my 2010 for about 12k miles now. No issues, have been performing just fine.
I used NGK at 100k miles and have been happy with them.
Skip the genuine spark plugs and just get NGKs. And skip the genuine oil change kit and get pentosin if you wanna stay oe
7751 are the OEM plugs and rated for ~105k miles, give or take.
I like my NGKs a lot. Never had any issues with them and they perform well
Honestly I think NGK plugs are better. Either one does the same thing, but I've never heard of a bad NGK plug, even well beyond its normal useful life.
Changing my sparkplugs for the first time (32k miles, yes it's early but I got a great deal on the plugs) and found that the stock plug in cylinder 4 actually had a ground electrode defect and was significantly thicker than normal. The car runs stronger than it ever has as this was likely causing extra timing pull.
I stick with ngk iridium
Have them for 15,000 miles on these and frankly can't tell the difference from (spec. plug) with original that it replaced. Gas mileage is no better and no worse.
If these are for a TJ (97-05) return them and get NTK (NGK). The 4.0 will not like anything else.
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