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Copper vs. Iridium spark plugs 700 1986

posted by  OldBlueVolvo on  Sat May 27 08:59 CST 2006
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last visit: Sun Feb 27 18:34 CST 2011
[RELATED]

I used to use Champion copper core spark plugs but decided to use Bosch super 4 plugs last year (these have the 4 electrodes). I found no difference in performance or fuel consumption though. I've recently read that the multi-electrode plugs are worse on performance. So, I'm going to try NGK plugs this year. Has anyone tried using NGK's iridium plugs? I would be interested to know whether the iridium plugs really are noticeably better than the traditional copper core plugs. Would the OEM Volvo plugs be best for a 740?

Cheers
Will






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