Average Reviews:
(More customer reviews)These plugs came as stock with my vehicle when I bought it new. I noticed a 20% fuel mileage drop and checked the plugs. After 40,000 miles they were showed practically no wear and the gap had changed minimally. I ordered a new set of plugs anyway just to be sure. In the meantime I installed a set of Delco plugs, the difference was night and day. The Delco plugs ran too cold so the idle was rougher and there was a slight drop in fuel mileage on top of the original 20%. When the new Denso plugs arrived I installed them and indexed them as well (even though indexing plugs on a SUV probably doesn't improve perfomance too much). The difference was definitely noticeable, there was definitely more power and the fuel mileage went back to the original 20% drop that prompted this experiment. Since all other factors that could account for a mileage drop had been accounted for I attribute the drop to blended fuels. I came to this conclusion because while on a road trip I stopped at a fuel station that sold straight unleaded fuel. With a tank of straight unleaded fuel my mileage returned to normal. If you switch to the Denso plug from a different brand I would recommend installing the Denso coils as well for optimum performance. The extra few bucks for the Denso plugs is definitely a value since the plugs will probably last for the advertised 100,000 miles and give you great performance as well.
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Product Description:
Iridium plugs have an extremely long life as Iridium is 6x harder and 8x stronger than platinum. Because of the strength and hardness of iridium, there is virtually no electrode wear. This combined with a platinum ground electrode, creates a spark plug that is almost impervious to wear even under extreme driving or racing conditions.
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