570 votes
I ran Denso iridiums for 100,000 miles on mine, they looked usable when I pulled them. Replaced them with NGK's, no difference in power generated.
Yes! I had a set of iridium spark plugs bought off Amazon that were counterfeit! They were denso but I didn’t discover it till about 40k miles later when I had a misfire. Pulled plugs and they were toast… first set lasted 120k and looked fine..
I use Denso IK20TT and these spark plugs work every time, on both fuels.
I tried Denso once and didn't have great luck with them.
I tried one of the economy plugs on my 02 Accord. Ended up having to chuck it and buy a Denso.
I put denso 5310 in mine, apparently they are supposed to give you a slight increase in power if you use premium fuel.
Idk if I gained any power, but the car runs well.
Have used NGK on my Toyota Prius v, works just fine, never had problems.
Changed them recently, still had factory Denso spark plugs, and they worked alright too, even after 121k miles of use.
I tried Denso once. I took Denso’s out and replaced them with Denso’s. They ran for 500 miles and quit.
I have eqt and the densos and they are smooth
Denso IKh024
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