NGK ILKAR7L11 Compared to Stock

[RamFan]

Coming up on 75k miles on the Mazda, and with a road trip coming up I figured it best to get the stock plugs replaced. For having 74,408 miles on them, I think they look great, and probably could’ve gone longer without issues.

 

[slacktide_bitog]

NGK and Denso both make great spark plugs

At least Mazda used Denso for all 4
(Honda and Toyota are known to have installed 2 Denso and 2 NGK in the same engine from the factory in many of their cars)

What does Mazda say to change them at? Iridium is usually good for 100k or more

 

[RamFan]

What does Mazda say to change them at? Iridium is usually good for 100k or more

Mazda specs 75k. I’ve decided to change plugs, trans fluid, t-case, and rear diff at 75k. I consider it a mini-refresh.

 

[daves87rs]

Not too bad for the plugs!

 

[hemitom]

plugs appear to be operating well at 75K.
Looks like you could run them out to 100k.

 

[hemitom]

just curious what type and grade of fuel do you use. ?

 

[RamFan]

just curious what type and grade of fuel do you use. ?

87 octane, always top tier. Typically Mobil.

 

[JeffKeryk]

(Honda and Toyota are known to have installed 2 Denso and 2 NGK in the same engine from the factory in many of their cars)

Our '06 TSX with the mighty K24 has 2 NGKs and 2 Densos. Kinda blew my mind when I originally replaced them at about 85K.
Maybe that's the secret?

 

[Superflan]

The center electrode seems bent?

 

[wpod]

Our '06 TSX with the mighty K24 has 2 NGKs and 2 Densos. Kinda blew my mind when I originally replaced them at about 85K.
Maybe that's the secret?

I bought a brand new 1992 Toyota truck with the 3.0 cyl. engine and when I did the first Spark plug change one bank had NGK the other had Denso. Didn't make any difference.