vs
Spark plug OEM FORD or Denso
Denso 3457 (FXE24HR11)
Why? It's the plug recommended in the owner's manual and I have never seen anyone have issues with this plug.
Why are they noticeably better than other equivalent plugs from reputable brands, I honestly don't know as it seems that the differences should be negligible. Plugs are one of the areas where the car is very fussy.
Pros: no issues, recommended by manual
Cons: negligible difference from others
Vehicle:
Infiniti
Part number: 3457 (FXE24HR11)
I finally changed out the OG Denso spark plugs on my wife's '10 RX350 at a shameful 415,000 kms. Wasn't idling rough but some low-rpms hesitation. Plugs still basically worked fine, though.
Pros: worked fine, very durable
Cons: low-rpms hesitation
Vehicle:
Lexus
Mileage: 415000 km
Toyota sounds like great deal if they actually use OEM plug (DENSO iridium). That part alone is \\~$18 each (you need 6).
Pros: great deal, OEM plug
DENSO , Iridium Long Life, SK20HPR-L11 Spark Plug
Pros: Iridium Long Life
Vehicle:
Subaru
Part number: SK20HPR-L11
I would stick with the specd Denso, leave the coils alone.
Vehicle:
Toyota Prius
I recently was having a misfire in cylinders 2/3, and new plugs and ignition coils cleared it up.
Pros: cleared up misfire
DENSO ZXE24HLR7 is also an excellent OE plug.
Pros: excellent OE plug
Part number: ZXE24HLR7
So i just ordered a pack of 4s (the left one is from Denso Japan) from a local distributor carrying Denso spark plugs and of the 4, 3 are made in China and 1 is made in Japan. Comparing them side by side, the China ones definitely look subpar to the naked eye.
Cons: subpar to the naked eye
I highly recommend avoiding anything other than exactly what is specified in your owners manual, I currently have bad gas mileage because I was too curious to see if the desno two tip would do as good as the other stuff.
Cons: bad gas mileage
definitely not ok, they are spent, also Denso>NgK any day of the week
Pros: Denso better than NGK
Cons: they are spent
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