I’ll stick with NGK and Denso.
I bought the absolute cheapest plugs available ($1.50/plug), and they are branded "Denso Toyota Iridium" - I assume fakes, but my magnifying glass does seem to show an iridium tip, and they work great.
I did Denso 3297 from RockAuto. They work great.
I've always used the Denso SK20R11 plugs in mine and been pleased.
Denso iridium plugs, no more no less and no exceptions.
denso iridium. do them and they’ll be good for another 200k km or more
Denso and Bosch have worked well for us on a 1.6.
Bought some Denso 3450 Irdium plugs online. After reading about counterfits. I decided to test mine.
All are gapped .43 for the OEM spec for a 2014 Nissan Xterra. I measured the Irdium electrode tip which is 0.7mm and appears blue
Avoid Champions. Use NGK or Denso. Don't go cheap on plugs because the job is labour intensive.
Side note, Champion spark plugs suck. Use them in lawn mowers.
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