autolite xp xtreme vs ac delco iridiums

[HighOctaneRacing]

autolite xp xtreme vs acdelco iridiums. what's your pick and why?

[Fivefingerdeathpunch]

autolite 606 are good plugs for these cars. Copper core or plats

[taman86]

ive heard of the ac delco's having cheap quality and the ceramic cracking easily

[HighOctaneRacing]

well the ac delco iridiums are made by ngk and i've heard from a vast amount of people that they r really good plugs and give you alot better fuel economy than the originals. look them up. theres a good amount of reviews

[machinegunsquid]

Just run some cheap ass Autolite copper cores. $2 each, and I've never had any sort of failure with them. Just replace them every 6-8months, and you'll be golden.

[SlowNA06]

Thing is, nobody's ever bothered to compare the stock Delco Iridiums with the Autolite XP Iridiums in any kind of testing environment. I mean, you'd have to find someone willing to drive 200,000 miles.

My experience with the Delco Iridiums is that I noticed my mileage degraded slightly around 70,000 miles in my stock '06 base GP. I put in fresh plugs, and mileage went back up to ~28mpg from ~22mpg. There was no big performance difference.