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I doubt you can tell much difference in any major brand. don t waste your money on Exotic Plugs that claim big HP and MPG gains.. you wont see it. I personally have used Autolite and AC for 40 years. Never had a problem with a single one ,usually lasting well over 100,000 miles. Some of our Members swear by NGK, also good plug... I don t however recommend Champion. I ve had many failures with theirs. By the way, Welcome to SV.
 

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5,591 Posts
about anything except champions
iridiums last longer than regular plugs
 

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