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The Autolite XP5405 is an iridium spark plug sized for many Chrysler, Dodge and Jeep V8 engines. Its fine-wire iridium center electrode and platinum pad on the ground electrode resist wear far longer than copper or nickel plugs, so it holds its gap and spark strength over a long service life. It suits owners doing a tune-up who want a long-lasting plug without paying for a premium brand. Compared with standard plugs it lasts longer and starts more reliably; compared with top-tier iridium plugs from NGK or Denso, it is a solid value choice rather than the enthusiast favorite.
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Lowest price we've seen: $10.95 on Nov 10 at Walmart. Tracked across 1 store since Nov 10.
Owners who fit these to Chrysler and Dodge V8s report smooth idle, easy starts and long life, and many say they match pricier plugs. A few found the gap needed adjusting out of the box.
