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 went with Bosch but you really can't go wrong with the 4 vendors you have listed.
So far we have; Changed to new spark plug wires, distributor cap and rotor and the distributor is not leaking oil, tried two different sets of spark plugs Bosch F6DTC and NGK/RIDIUM BKR6EIX.
Bosch finewires suck dong and AFAIK are not OE for anything even though they claim they're OE for practically every car on the road.
Bosch platinum are trash.
I’ve heard bad things from mechanics about Bosch, specifically Bosch platinum.
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