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The Autolite Extreme Start XST4265 is an iridium-enhanced spark plug with a fine-wire center electrode and a yttrium-enhanced ground electrode. Autolite claims quicker, more consistent starts than standard copper plugs and better heat transfer under high temperatures and pressure. The multi-rib alumina ceramic insulator adds strength and insulation. It suits small engines in outdoor power equipment, where a durable plug matters more than long service intervals. Against basic copper plugs it offers longer life and steadier firing; against premium iridium plugs from NGK or Denso, it is a simpler, value-focused option.
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Lowest price we've seen: $5.99 on Nov 10 at NAPA. Tracked across 1 store since Nov 10.
The Autolite Extreme Start XST4265 is an iridium-enhanced spark plug in the performance grade. It is designed for outdoor equipment, including lawn and garden equipment. The spec sheet lists the vehicle type as car.
The fine-wire center electrode is iridium-enhanced and provides 26% quicker, more consistent starts compared to standard copper plugs. The ground electrode is yttrium-enhanced for better heat transfer, which adds durability under high temperatures and pressure. The multi-rib ceramic insulator is made of high alumina for thermal conductivity and strong insulation.
