vs
Spark plug OEM BMW or Denso
Either one, but I found the Denso to be cheaper and easier to get. No issues with them.
Pros: cheaper, easy to get
Cons: none
Vehicle:
Volkswagen Golf
You can usually find DENSO IRIDIUM Spark Plugs , which are the OEM Supplier, for about $15 each at any Advance Auto or other major auto parts store.
Pros: easy to find, oem supplier
Yesss got denso coils and spark plugs off their site and they have been great
Pros: great performance
And, before you get too far, are you replacing with the right plugs? I presume it’s the 2AZ 4-cyl since you’re not asking us how to get to the back plugs. The right ones are the Denso Iridium Long Life or the NGK Laser Iridium.
I had similar problems with mine until I tried stock F80 M3 plugs. Mfg #12120039634KT1. Mine was 07 N54 FBO.
Vehicle:
BMW
Part number: 12120039634KT1
I use Denso IK20TT and these spark plugs work every time, on both fuels.
Pros: reliable on both fuels
Vehicle:
Volkswagen Golf
I put denso 5310 in mine, apparently they are supposed to give you a slight increase in power if you use premium fuel.
Idk if I gained any power, but the car runs well.
Pros: car runs well
Cons: power increase uncertain
Part number: 5310
For what it's worth, I've changed my plugs twice (OEM to Denso to Beru-RS7) and never noticed any oil or any difference in color between the plugs.
Pros: no oil, no color difference
I have the 24's, not impressed.
Cons: not impressed
Vehicle:
Audi
the densos work fine, the point of swapping is not for any performance gain, rather to prevent shattered ceramic from raining into your cylinders
Pros: work fine (normal use)
Cons: risk of ceramic shattering
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