2005 Grand Cherokee 5.7L
Hi just checked and yes the plugs should be replaced at 30,000 miles all 16 of them
i believe all the newer hemi's are 30000
I have a 2009 5.7 Grand Cherokee , Say change at 30,000 miles, I took mine out at 30,000 miles and looked as good as new plugs . Changed them and later talked to mechanic at Jeep , he said if they looked good , put them back in . Owner's manual doesn't say that . Also Be careful , if socket is too big , will not come out of tube, also it pays to buy a socket with extension made on it. If it sticks in tube you have something to pull it out with that won't come out of socket .
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