Congratulations on your DIY adventure. Skyactiv-G spark plug replacement is an excellent DIY project even for a beginner. Just a couple of tools and not much to go wrong.
Plugs appear pretty typical to me. The last on the right looks a little wet and carboned up but that doesn't necessarily mean anything .
Did you use a torque wrench to put the new plugs in or do it by feel (like finger tight + 1/4 or 1/2 turn something like that)?
Good job.
Wait, your factory spark plugs are the rare PE5S-18-110 instead of commonly seen PE5R-18-110?Just did mine at almost 82,000 miles, surprisingly easy. Highly recommend using a 14mm spark plug socket with extension. That's one deep hole.
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What you see is what's there. What exactly are you looking for?Wait, your factory spark plugs are the rare PE5S-18-110 instead of commonly seen PE5R-18-110?
PE5R-18-110 is made by NGK and has NGK’s “LKAR7L11” model number imprint on ceramic insulator.
PE5S-18-110 isn’t available for sale in US Mazda dealers and it supposed to be made by Denso and is equivalent to ZC20HPR11. Can you see any info on your factory plug related to Denso ZC20HPR11 plug? Please let us know.
What is the wording after the “110” on the top line? Looks like a bold “MAZDA”? The leftmost one seems to say “PR11” but can’t see clearly the whole second line wording as it’s covered by brownish deposit?What you see is what's there. What exactly are you looking for?
What is the wording after the “110” on the top line? Looks like a bold “MAZDA”? The leftmost one seems to say “PR11” but can’t see clearly the whole second line wording as it’s covered by brownish deposit?
I guess if you still have the old plugs, clean up the ceramic insulator and post the 2 line imprints would be appreciated.
And do you have the link for that nice long 14mm spark plug socket?
What is the wording after the “110” on the top line? Looks like a bold “MAZDA”? The leftmost one seems to say “PR11” but can’t see clearly the whole second line wording as it’s covered by brownish deposit?
I guess if you still have the old plugs, clean up the ceramic insulator and post the 2 line imprints would be appreciated.
And do you have the link for that nice long 14mm spark plug socket?
Thanks for the video! Now it’s been verified. Mazda spark plug PE5S-18-110 is indeed the Denso ZC20HPR11 plug. People can get Denso ZC20HPR11 plug as another alternative other than the NGK ILKAR7L11 plug for their 2.5L NA.
Firstly PE5S-18-110, although listed in owner’s manual, isn’t available in US Mazda dealers. I want to see what kind of the plug PE5S-18-110 really is just like I want to see the MV spark plugs. Secondly, some had said PE5S-18-110 is made by Denso. But I’ve never seen any complete pictures (or video in your case) showing the PE5S-18-110 plugs before. With Denso’s “ZC20HPR11” model number imprint on OEM plug ceramic insulator, people can get the same Denso plug and use it on the 2.5L NA with confidence.Yes...it's in the owners manual spec area:
Spark-plug number Mazda Genuine spark plug*1 PE5R-18-110 or PE5S-18-110
Why is this such a revelation?