I don't understand why you didn't just get the NGK iridium plugs.
Vehicle:
Subaru
Owner reviews for spark plug
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The plugs are great-- zero issues, can't tell a difference.
Pros: zero issues, great
Vehicle:
Subaru
Mileage: 5000 km
Denso Iridium 1 step colder plugs. Running great on my 2017 Jetta 1.4T
Pros: running great
Vehicle:
Volkswagen Jetta
Part number: 5308 IXU22
I've ventured from NGKs and always go running back.
Pros: reliable performance
Only issue I’ve had is having 2 spark plugs blow out. The first time required a replacement head and the second was fixed with a helicoil. Most reliable vehicle I have owned.
Pros: most reliable vehicle
Cons: spark plugs blow out
Vehicle:
Honda Ridgeline
Mileage: 311000 km
I did reduce the gap of the PFR7Bs to 0.025" when I was running DriverMotorsports K04+ tune and it boosted more than 26 psi. I did so due to upper rev stumbling, but for being back to running my GIAC HO K04 tune...0.028" works. PFR7B usually work great with higher boost from turbos and tunes when you do notice the stumbling for having arc disturbance.
Pros: work great with high boost
Cons: stumbling with wrong gap
Vehicle:
Volkswagen
Part number: PFR7B
For spark, I wasn't sure I had the right plugs so I went with the OEM Champion plugs that were recommended in the Bentley. I checked for spark, no issues there.
Pros: no issues with spark
Vehicle:
Volkswagen Fox
2005 CVPI...180,000 mi....spark plug blown out of head. The Crown Vic was purchased at auction for $4200 a bunch of years ago with 100,000 miles and was very good to us until about a week ago...original engine, suspension parts, transmission and very few repairs.
Pros: very few repairs
Cons: spark plug blown
Vehicle:
Ford Crown Victoria I
Mileage: 289682 km
This is why I don't use Bosch plugs. It goes back to the quad fire plugs with a platinum center electrode that would fall out.
Cons: platinum electrode fall out
Long story short: changed spark plugs 4000km ago as per my 2019 Hyundai Kona 1.6t manual. Followed Service manual, and the recommended torque on the side of the box of the Bosch (non OEM) replacement, 17 ftlbs.
Grounding electrode on plug #3 failed, destroying 2 valves and marking up the cylinder wall.
Cons: grounding electrode failed
Vehicle:
Hyundai
Mileage: 4000 km
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