137 votes
When I got my S60 (2006, T5) the previous owner had some copper AC Delco plugs made to fit an 850 non turbo in it and I wondered why there was very slow engine response.
I replaced them with AC Delco 14 Platinums, and it seems to be running better.
Just did mine with ac Delco, gapped them in advance and running great!
In my personal experience (99 suburban 6.2l 383) AC Delco spark plugs are the way to go
ditch the delco plugs, they are trash. And delcos are shit plugs.
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.
Standard replacement CR43TS Delco plugs, and a decent brand of wires. Bosch makes nice wires. Our engines don't exactly tax the ignition system, so if it's functional, you don't stand to gain much.
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.
Acdelco plugs....Never had problems with either
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