John/Horace Posted August 1 Report Share Posted August 1 (edited) From bob is the oil guy forum, long time established internet site. Here's what NGK emailed back to me today when I asked if there was any data to support the idea that it is o.k. (or not) to use platinum or irridium plugs in a FCA vehicle that came from the factory with standard copper core/nickel electrode plugs: "Hello, Thank you for your E-mail. I do not have any data for you, but the reason I believe they used nickel spark plugs up to 2013 is they wanted to keep cost down. After enough customer complaining on service life, in 2014 they switched to an iridium spark plug. NGK has the iridium version listed as an upgrade for the OE nickel for pre-2014 models. An iridium spark plug will always be more efficient in flame propagation than a nickel spark plug. Regards, Michael Durocher, Technical and Training Specialist , NGK Spark Plugs (USA), Inc." Edited August 1 by John/Horace Quote Link to comment Share on other sites More sharing options...
John/Horace Posted August 1 Author Report Share Posted August 1 (edited) No hesitation or fuel economy issue. Could have regapped used plugs but decided for new NGK single plat cheaper plug. Lots more info on BITOG site. My pics of used plugs below. Still running orig coils at 165k kms(100k miles), dash gauge fuel rating was showing 9.6/100 kms, normal. https://bobistheoilguy.com/forums/threads/clarification-on-upgrading-spark-plugs.302965/ Edited August 1 by John/Horace jkeaton 1 Quote Link to comment Share on other sites More sharing options...
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