Denso 5305 Iridium Spark Plug , Pack of 1 Review

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(More customer reviews)I fitted this plugs into a Chevrolet Spark a while ago, haven't caused me trouble at all. Thought i had to adjust the gap of the plugs ( since usually new ones are a bit separated), starting the engine became faster and warming too, felt the acceleration somewhat stronger, fuel economy is a bit higher than OEM ones ( think this plugs might work better into bigger engines) but as I told you already they are doing great no foul ones, and burning equally.

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Denso Iridium Spark Plugs are designed to ignite the air-fuel mixture in the engine cylinder by generating sparks between the center electrode and earth electrode. They employ an iridium alloy for the center electrodes and provide superb ignition performance. These plugs have lower fuel consumption and higher acceleration performance as well as stable combustion during idling, which contribute to the cleaner exhaust.

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Denso (5305) IW16 Iridium Spark Plug, Pack of 1 Review

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(More customer reviews)This has the 0.4mm tip which Denso says to replace in 30,000 miles. I replaced the distributor cap, rotor and the plugs as I do each 10,000 miles. When I purchased them I assumed they would last 120,000 miles, but the ones that last that long have the 0.7mm tip. My 1994 4 cyl Toyota pickup runs better and idles more smoothly.
For the last 21 tanks of gas the average gas mileage was 19.819. With the Iridium plugs the mileage was 21.045. I normally use 89 octane on the next tank I will try 87 because I read the iridium reacts with the benzine for a better burn.
Based on the improvement above I would use 88.188 less gallons of gas over a 30,000 mile period which would save $238.11 based on gas at $2.70 a gallon.
The newer cars (my 2003 Corolla is an example) came with iridium plugs so I would think only the older cars would benefit from this upgrade.
I used Amsoil Performance Improver, the tank that ran the PI got 20.3 mpg, the last time I ran a tank of PI I got 17.5 mpg with regular Toyota plugs. I continue to get about 1.1 mpg better with these plugs.

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Denso Iridium Spark Plug Denso's Iridium power spark plugs help your vehicle achieve unparalleled performance. It alters the belief that a mere spark plug can add power and mileage. This is done by combining an ultra-fine 0.4mm diameter Iridium center electrode with a tapered cut U-groove ground electrode. Iridium conducts electricity better than platinum, however what makes it exceptional is it's also 6x harder and 8x stronger than platinum. Because of this, the center electrode can be machined down to 0.4mm. This ultra-fine iridium center electrode provides superior ignition performance during acceleration and top cruising RPM. The U-groove ground electrode creates a larger, brighter flame kernel. The tip of the ground electrode has been tapered which further improves firing performance by reducing quenching. All of these features combine to give more horsepower to your motor. Technical Specifications - 14mm Thread, 19mm (3/4") Reach, 13/16" (20.6mm) Hex Size, Gasket Seat, Resistor, Removable Terminal, 0.4mm Iridium Projected Center Electrode, Tapered Cut U-groove Ground, .044" (1.1mm) Gap

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Autolite XP3923 Xtreme Performance Iridium Spark Plug , Pack of 1 Review

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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 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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Bosch (4506) WGR8DQI Platinum IR Fusion Spark Plug, Pack of 1 Review

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(More customer reviews)You can find a better deal somewhere else for these plugs. Amazon claims they are 89% off. You would think you're getting a pack of 4 plugs for a deal like that. This is not true. You only get 1 spark plug. Name one bosch plug that has a retail of over $52? I have found other issues where Amazon shows a bogus MSRP for items. DO NOT BUY THESE!

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Bosch Platinum IR Fusion spark plug has an iridium and platinum fused center electrode with surface air-gap firing delivering optimum horsepower, better than OE iridium plugs.

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