Review on NGK 54393 EUX004 Spark Plug by Chris Hanson

Good fit for Jaguar XJ6 Series 3 (also S1 and S2). Comes with 2 spools of different lengths for gibber wire, but both have a large sheath on one side and a small sheath on the other. For the Jag, you'll have to remove the big boot from the one you're going to use and replace it with the small boot from the one you're not using. After that it fits perfectly. NGK does good. Combined with a set of new standard NGK 7734 spark plugs, the old Jag is ready to go. Do yourself a favor and don't get carried away by fancy iridium-platinum split-flame spark plugs. Simply buy the standard plugs that your vehicle was designed to use. This stuff might be great for new cars (I doubt it), but old Jaguars love regular spark plugs. If you want your Jag to perform better, make sure there are no leaks in any of the air ducts behind the mass air flow sensor. It's much more useful (and cheaper) to check rare earth spark plugs and then spend a coin.