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- Plano, Texas, USA
That’s why I said choosing the spark plugs on our CX-5 is a personal preference. To me, I’d get the expensive OEM plugs just to make sure the plugs are 100% compatible, no ifs or buts. My time is more valuable especially I’m getting older and don’t want to redo any jobs I’ve done.So, I know the price on Rockauto is about $40 for four NGK plugs based on earlier comments. While at advanced auto its about $18.27 a plug. I believe Advanced Auto is an authorized re-seller of NGK. If I use the NGK, I will probably pick them up at Advanced Auto. Plus they have plenty of stores around incase I need to return.
For SkyActiv-G 2.5L the OEM spark plugs have 2 types: PE5R-18-110 and PE5S-18-110. PE5R-18-110 is made by NGK and PE5S-18-110 is made by Denso.So can the Mazda denso or Denso spark plug be used also? Mazda lists another plug that is a Denso. The Denso equivalent for PE5S-18-110 is Denso ZC20HPR11
The NGK equivalent for PE5R-18-110 is NGK Laser Iridium spark plug ILKAR7L11 / 94124.
The Denso equivalent for PE5S-18-110 is Denso ZC20HPR11.
You can’t get OEM Denso plugs PE5S-18-110 from any Mazda dealers in the US as far as I know. But you can find Denso equivalent ZC20HPR11 for cheaper price than NGK ILKAR7L11 / 94124. Some had tried Denso ZC20HPR11’s without any ill effects either.