Question:

Who makes great spark plugs?

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NGK is the absolute best, but they do not make plugs for everything. Next in line would be any maker other than champion or autolite. Do not waste money on plugs with more than one ground strap, or platinum plugs, they do nothing except cost you more money....
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When I buy,I ask for either NGK or DENSO,never problem,Bosch is the worst.
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NGK
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NGK, AC, Boche, anything but Champion
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NGK!
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DENSO is pretty good
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Depends on the application. Most modern cars will use Platinum or Iridium plugs for longer life. I normally put in what comes factory. Denso or NGK for most Japanese vehicles, Bosch for most European, AC Delco for most GM's, Motorcraft for most Fords, Champion for most Chryslers.
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