the original spark plugs died (delphi) so i changed them for Bosch ones
Reviews of Bosch spark plug
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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
Since I mounted Bosch 4-prong spark plugs, fuel economy has improved a lot. Gone from 12-13 km/l to nearly 15 km/l.
Pros: fuel economy improved
Vehicle:
Mazda
Bosch spark plugs are also trash.
Cons: trash quality
I have only used Bosch plugs in my cars, and I have not had any issues with them yet.
Pros: no issues yet
Bosch iridiums, these for longevity, copper ones have better spark if your concern is performance
Pros: longevity, better spark
Those spark plugs are junk, and on top of that, they are now carbon fouled. I would strongly encourage you to install new, normal, spark plugs.
Cons: spark plugs are junk
Vehicle:
Volkswagen
Today I installed new spark plugs and the misfiring situation has improved significantly but is not completely gone. If I pull up the RPM too quickly the misfire counter goes up.
Pros: misfiring situation improved
Cons: misfire not completely gone
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