Spark plug Bosch or Denso

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Denso Spark plug

Denso itv20 (5339) for stock/mostly stock. ITV22 (5340) step colder if more mods. I have only used itv22 since 2015.

Pros: good for stock
Cons: only for stock
Part number: 5339
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Bosch Spark plug

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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Bosch Spark plug
Dry_Lie7866
Rating 1.0
  • Acceleration:

I just put Bosch plugs in my 13 Veloster turbo and got 300 miles and it started missing replaced with the ngks no issue since

Cons: started missing after miles
Vehicle: Hyundai Veloster
Mileage: 482 km
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