Compared across 3 stores. Prices are checked against each store and labelled with when. Store links may earn us a commission. Price via Klarna.
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The Autolite Iridium Ultra is Autolite's top-tier spark plug, with a fine-wire iridium center electrode and a platinum side electrode for long service life and a strong, consistent spark. The AI5701 is a 4-pack of the plug Honda specifies for many of its four-cylinder engines, so it is a direct-fit replacement for worn factory plugs. Against copper and platinum plugs it lasts far longer and holds its gap better, though it costs more per plug than standard nickel-alloy options. It suits owners doing a scheduled tune-up who want to fit once and forget it for many miles.
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Lowest price we've seen: $11.37 on Nov 10 at Walmart. Tracked across 3 stores since Nov 10.
Owners who fit these to Honda engines generally report smooth idle, easy starts and no issues over long intervals. Some note the higher cost versus standard plugs and warn that the fine tip needs careful handling during installation.
