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The Bosch 9614 is an OE Fine Wire double iridium spark plug sold in a pack of four. Both the center electrode and the ground electrode inlay are iridium, which Bosch rates for up to four times the life of a standard copper plug. The fine-wire tip needs up to 24 percent less voltage to fire, and a copper core widens the heat range to resist pre-ignition and fouling. Plugs come pre-gapped with nickel-plated threads, so they go in without gap adjustment or anti-seize. It suits drivers replacing plugs on a daily-driven car who want long service life without paying for a premium brand's top tier. Against single-iridium and platinum plugs it lasts longer and fires more easily; against standard copper plugs it costs more but needs far fewer changes. Owners report a noticeable performance improvement and smooth running after fitting.
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Lowest price we've seen: $12.49 on Nov 10 at Advance Auto Parts. Tracked across 1 store since Nov 10.
Buyers who fitted these plugs report a noticeable performance improvement and a car that runs as it should. They call the quality good for the money and say they would buy again.
The Bosch OE Fine Wire Double Iridium spark plug is sold in a pack of 4 for cars. It has an iridium firing pin and an iridium ground electrode inlay. The fine wire design requires up to 24% less voltage to ignite.
Each plug has a copper center electrode core, which gives a broader heat range to resist pre-ignition and fouling. The insulator is ceramic, and 360 degree continuous laser welding increases durability. Bosch states a life of up to 4 times that of standard copper spark plugs.
The plugs come pre-gapped, and the threads are nickel plated. This allows quick installation without adjusting the gap or applying anti-seize.
