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spark plug?

what is the factory recommended spark plug fo an '01 XJ?

AMC recommended Champion, and I think ChryCo recommended either Champion or NGK (the latter would be Mitsubishi's influence...)

I don't have the plug numbers handy at the moment. However, given the fact that I don't personally like Champions in any larger than a lawnmower (bad experience some 20-odd years ago...) I stick to Autolite or Autolite platinum with consistently good results in pretty much everything.
 
Most recommend champion truck plugs, personally i have always gone with regular NGK copper plugs in all my cars/trucks. Been running them w/o a problem. Any decent copper plug is fine, and make sure the gap is good.
 
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