Spark plug Denso or AC DELCO

I have ACDelcos in my 2010.

I've changed them twice over the 120k or so that I've had the car and I didn't pay attention to what was in it when I bought it, but the person who owned the car before me had a receipt from Advance.

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 have eqt and the densos and they are smooth

New Denso wires (these were the OEMs, cheaper to not pay ac delco mark up) and AC-Delco 41-962 plugs.

AC Delco/NGK.

IMHO, this is one of the times where the OEM stuff might be the best way to go, especially if your engine is otherwise stock. It's really common to see these trucks get well over 150,000 out of the original plugs and wires. They're kind of expensive but they just last so long it's worth it.

Denso IKh024

I bought six ac delco spark plugs from Rockauto and half were made in France and half were made in the US. There are very slight differences like the diameter of the electrode and how deep the plug is on the end that goes into the cylinder. Even one of the US plugs is different from the other two.

Skip them, they are junk and a waste of money.

Get a good single platinum plug like the Denso 4511.

I have a 1986 blazer and replaced the spark plugs with ac delco factory spark plugs purchased from napa, about 2 months later I was driving the vehicle and the vehicle had a miss then starting blowing out oil from the Pcv vlave from excessively high crank case pressure after electrode fell out.