2016 Mazda CX-5 GT AWD w/Tech Pkg
- Plano, Texas, USA
What Chris_Top_Her has said does have his base. OVT (OrangeVirus Tuning) had posted following comments several years ago here.
Without getting into too much detail...you guys really...really..really want to use OEM plugs....
the reason is because the ECU uses the ignition coils, which measure a resistance across the OEM plug for pre-ignition, and extremely low levels of knock retard the knock sensor cannot pick up, along with that it gives the ECU individual cylinder information, the spark plugs are actually used "as a sensor."
How it works exactly is proprietary information that I am not willing to share, you want to use OEM plugs.