They are great. Also around 12k miles on mine - no issues.
Pros: they are great, no issues
Mileage: 12000 km
Owner reviews for spark plug
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Yeah I've had these on my 2010 for about 12k miles now. No issues, have been performing just fine.
Pros: performing just fine
Cons: no issues
Vehicle:
Nissan
Mileage: 12000 km
Plugs(Denso IK22) coils(DENSO or Hitachi) and a valve adjustment, all due at 100k. They really do make them run better and much more reliably.
Pros: run better, more reliably
Mileage: 100000 km
We used to put Bosch W7DTC spark plugs in them. No gapping required, smoother idle, and they last 60k miles, maybe more.
Pros: smoother idle, long lasting
Cons: no gapping required
Vehicle:
Volkswagen
Mileage: 96000 km
Part number: W7DTC
You can get NGK or Bosch plugs on rockauto for around $10. Not sure which was OEM, some like NGK for Mercedes in general but Bosch tends to be the OEM maker of plugs for MB.
Pros: plugs available on rockauto
Vehicle:
Mercedes
I recently changed my spark plugs on 2012 Ford Focus. I used Bosch and got a 3 MPG boost.
Pros: 3 MPG boost
Vehicle:
Ford Focus
Motorcraft is all I use , heard to many stories about aftermarket plugs causing misfires
Cons: aftermarket plugs causing misfires
That’s curious….. if you look closely at the end of the shorter plug you can see another set of threads, it looks like there an insert threaded onto that spark plug. It would appear that it wouldn’t be sitting where it needs to in the combustion chamber so that may explain your misfire.
Cons: misfire
Vehicle:
Volkswagen
Bosch spark plugs are also trash.
Cons: trash quality
Autolite plugs are bad.
Cons: bad quality
Part number: FR7HE02
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