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These are Bosch's fine-wire iridium spark plugs, sold as a set of six. Each plug uses an iridium firing pin and an iridium inlay on the ground electrode, which Bosch says lasts up to four times longer than standard copper plugs. The fine-wire design needs up to 24% less voltage to fire, and the copper core widens the heat range to resist pre-ignition and fouling. They come pre-gapped with nickel-plated threads, so they go in without gapping or anti-seize. Owners report smoother running, better fuel economy and long service life, though some had plugs arrive with the gap off and one warned against using them in Nissan and Infiniti engines.
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Lowest price we've seen: $10.99 on Nov 10 at Advance Auto Parts. Tracked across 1 store since Nov 10.
Buyers mostly report smooth running, better fuel economy and long life, with several passing 60,000 miles. A few had plugs arrive with the gap off, and one says they ran badly in a Nissan or Infiniti engine.
This set contains six Bosch Fine Wire Iridium spark plugs. Each plug has double iridium electrodes: an iridium firing pin and an iridium inlay on the ground electrode. The OE Fine Wire design requires up to 24% less voltage to ignite.
The plugs use 360 degree continuous laser welding for added durability. A copper core gives a broader heat range, which helps resist pre-ignition and fouling. Bosch states a life of up to 4 times that of standard copper spark plugs.
The plugs come pre-gapped, so the gap does not need adjusting before installation. The threads are nickel plated, and anti-seize is not needed.
