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(More customer reviews)Got some Autolite XP 3923s for my Toyota Sienna 2001. And they seem to work fine as replacements. Fast start, smooth idle, and the engine runs just like using OEM NGK or Denso plugs. But these are considerably cheaper and come with a 5 yr warranty. Based on a previous reviewer, I was afraid the end of the plug was going to have a strange head that would cause my Sienna ignition wire boots to slip off the end every couple of days. But the head was similar in shape to the dealer installed Denso long life iridium SK20R11's. Moreover, ignition wire boot slipping off won't happen on newer Toyota's which have separate ignition coil/boot pairs for each pair of plugs (3 sets for a V6 ) and these are each screwed down with a 10mm x 40mm long bolt to the engine block. So no slipping fears at least for me. Also, I can report no noticeable decrease in mileage. And the minivan drives as dependably as it usually has with smooth acceleration. It was really simple to replace these on the front 3, but as usual with tranverse mount V6 Toyotas, changing out the back 3 is difficult due to restricted access for tools to get back in there, which is why I hope these last a LONG time. We'll see how the 5 yr warranty holds up.
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Autolite XP3923 Xtreme Performance Iridium Spark Plug , Pack of 1Autolite XP Xtreme Performance spark plugs are one of the brand's most technologically advanced spark plugs. Consumers get the benefits of patented platinum sidewire technology for improved durability and longer life, along with an iridium-enhanced .6mm finewire design for improved ignitability. Independent lab tests show that Autolite XP Xtreme Performance spark plugs provide better overall ignitability and durability than many other premium spark plugs. By increasing the size of the flame kernel (a 21 percent bigger flame compared to standard sparkplugs), these Autolite spark plugs ignite more gas and air mixture inside the cylinders to deliver better overall ignition. The ignition is more focused, which provides faster fuel combustion, optimizing the vehicle's spark plug performance. In addition, the Autolite XP Xtreme Performance spark plug offers drivers the same durability as the Autolite Double Platinum sparkplug virtually no gap erosion, longer life, and top fuel efficiency over the life of the plug. Autolite XP Xtreme Performance sparkplugs can be used in nearly 90 percent of passenger cars and light duty trucks on the road today.
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