I need to buy a new set of Autolite 3923 plugs. When buying plugs, is there any significant difference between the regular, platinum, and double platinum plugs? Only things I have seen, heard, or read are:
-Regular plugs are much cheaper,
-Regular plugs supposedly don't last as long,
-Double platinum plugs supposedly don't work well with hi power ignitions (if you've upgraded your ignition I guess).

What are your thoughts?

 

I replaced the stock plugs with Bosch Platinum. Did I notice a difference???? Not really.... But you know how it goes.... some people would. I have an 01 5.2

 

I tried platinums in my 5.2 ,ran like crap in cold weather.put regular one's back in. Much better now