vs
Spark plug OEM BMW or Denso
Fitting a decent set (Denso or NGK) of iridium plugs is also worthwhile.
Pros: worthwhile
Vehicle:
Subaru Legacy
I almost went 200000 km on my bmw between spark plug changes, and the motor runs so much better after. My fuel economy almost doubled, and performance was a night and day difference
Pros: motor runs better, fuel economy doubled
Vehicle:
BMW
Mileage: 200000 km
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 already replaced the spark plugs with the Denso ones I listed though... Is this bad?
Vehicle:
Lexus
Mileage: 60000 km
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
I dug factory installed spark plugs out of my recently departed E90... they looked like something from the stone age. 19 year old car, and from what I could tell, never had the plugs changes.
Cons: old spark plugs
Vehicle:
BMW
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