OEM Toyota plugs will probably last forever but it depends if your gas mileage is like 5 to 10 miles less that's the only way I would change the back plugs.
NGK OEM equivalents or Denso IK22 for a slight bump in performance.
I’m running Denso plugs in my car…no issues to report.
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.
Spark plugs 100k miles - $25
I did Denso 3297 from RockAuto. They work great.
Bought a 03 100 series with 241,000 only issue was the number 7 spark plug blew out, had to re-tap it and install a aluminum sleeve, and replace the coil
I got some phony Denso marked spark plugs
Porcelain tip fell off one Denso spark plug in cylinder 1. Doing less the 200km distance. Motor is f@$ked.
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