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

Average Reviews:

(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.

Click Here to see more reviews about: Denso (5305) IW16 Iridium Spark Plug, Pack of 1

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

Get 8% OFF

Buy cheap Denso (5305) IW16 Iridium Spark Plug, Pack of 1 now.