Bosh Double Iridium is the best value. AC Delco as well as the NGK only have an iridium electrode. The Bosh plugs have iridium laser welded to the ground electrode as well. The advantage is that it stays cleaner when it gets up to temperature and will have virtually no wear. Don't get Autolite. Their plugs are almost always out of spec. Out of the box you can ohm them out and 1 of the 4 is guaranteed to be out of spec.
That is what I am running in this 1996 Corolla and my gas Mileage is better than ever! Made a huge difference in power .
For the last twenty or so years I have only used Bosch plugs. I have had great service in my VWs, Toyotas and Ford.
if not oem ACDelco get ones from the likes of ngk, or bosch.
When I had dino burner cars, I did all of my own work, and always used Bosch Platinum plugs for my specific engine and heat. Iridium last the longest life, but are more sensitive to getting hot and causing pinging.
I have never seen any real large difference in NGK, Denso, and Champion if the proper heat range/type plug was used.
I'm not a fan of the old platinum Bosch design or regular autolite.
i bought ngk plugs and bosch platinum triple diode plugs and i got the coil pack off ebay.
I found Bosch platinum plugs misfired intermittently on GM v8s with the optispark distributor despite being identical to the Delcos.
Lesson learned: DO NOT EVER EVER EVER USE BOSCH PLATINUM (STANDARD TIP) SPARK PLUGS IN YOUR VR6 ENGINE.... THEY JUST DON'T WORK!
If you use anything but OEM plugs in a stock white block, well just don't do that. Also Bosch Platinum, great for having to pull your head and find out what the center of the plug did to your engine
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