Spark plug Denso or AC DELCO

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

I'd use the original equipment AC Delco plug. Rockauto has them for $6.31 each, with a $3 per plug rebate offered.

At least with double iridium ACDELCO on the c5. It’s 100k intervals.

Denso and Bosch have worked well for us on a 1.6.

Denso itv20 (5339) for stock/mostly stock. ITV22 (5340) step colder if more mods. I have only used itv22 since 2015.

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.

I tried one of the economy plugs on my 02 Accord. Ended up having to chuck it and buy a Denso.

I tried Denso once. I took Denso’s out and replaced them with Denso’s. They ran for 500 miles and quit.