Two Different NGK Irdium Sparkplugs?

[kw_da]

I'm confused. It appears there are 2 different NGK Irdium sparkplugs for my 2006 Mazda 5 Sport (http://www.ngksparkplugs.com/part_finder/car_truck_suv/results.asp). Amazon says only this (https://www.amazon.com/dp/ (commissions earned)) is good for my car, but the manual says ITR5F13 (http://www.ngksparkplugs.com/part_finder/car_truck_suv/results.asp) are recommended, which Amazon says are not for my car.

What are people using (exact model), and does anyone know the difference between the 2 NGKs? The NGK says the IX are more performance related? (they are cheaper).

Any suggestions?

Also, what online vendor are people using for buying Mazda stuff? http://www.mazdaparts.org/ has free shipping for stuff > $100 total, but they charge a bit more than other vendors, so it can be a little more expensive.

 

[Bluesideup]

The more expensive ones are the OEM, Laser Iridium I think. They are designed to last 75k miles. The cheaper ones are about half of the lifespan.

 

[kw_da]

thanks, I did some more googling and found the following http://www.ngksparkplugs.com/pdf/DYK_LaserIridium_vs_Iridium%20IX.pdf ... so you were correct. Just looking at each sparkplug's description didn't help much.