Spark plug Bosch or NGK

Bosch Spark plug

Bosch should be the safest choice for German cars, but avoid their gimmicky "Plus 4" plugs that have 4 ground electrodes, unless that's what the car came with from the factory.

Pros: safest choice
Cons: gimmicky plugs
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NGK Spark plug
B5Speedo
  • Idle:
  • Acceleration:
Rating 4.0

Got new NGK BKR8EIX pugs today and gapped them to 0.024". Originally, 0.030" according to my gauge. Very surprised when I removed the old plugs as they were all at varying degrees of tightness even though they were originally torqued to 25NM. Car runs great with the new plugs. No complaints so far.

Pros: car runs great
Cons: varying degrees of tightness
Mileage: 20000 km
Part number: BKR8EIX
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NGK Spark plug
Craig380
  • Starting:
Rating 5.0

I ***always*** use NGK spark plugs after I tried a set of Champion plugs in my old GT380, and two of them failed after 1,500 miles. NGKs have never let me down in 35+ years of riding.

Pros: never let me down
Cons: Champion plugs failed
Vehicle: Suzuki
Mileage: 1500 km
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Bosch Spark plug

I have never seen any real large difference in NGK, Denso, and Champion if the proper heat range/type plug was used.

I'm not a fan of the old platinum Bosch design or regular autolite.

Pros: proper heat range works
Cons: not a fan
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