Is this for the CX-9 with the 2.5 turbo or for the Mazda 2.5L (non-turbo)?NGK 94124 is the replacement for the OE Denso. Other direct replacement brands are available as well.
I believe that the turbo engines like CX-9 are 40K and the NA engines are 100K. In addition to our CX-9 we also have a Kia Optima turbo with Iridium plugs that have a 40K interval. There have been reports on the Kia forums that heat stress from the turbos, can crack the insulators. There have been reports of plug tips coming loose and damaging cylinder bores and valve on engines where plug changes were postponed. Not good for engine life.What is bizarre is that the 94124 are Iridium plugs. These last a very long time, usually close to 100k miles. Mazda recommends that we change them every 40k miles. I wonder why? Is the OEM plug a non-iridium plug?