I use Autolite 3923 and they smoothed out my motor quite a bit and the truck loves them. I have 3.7 V-6 which is basically the same motor w/ 2 cylinders lopped off.

 

What about the E3 spark plugs on a 3.9L V6??

 

personally not a fan of triple prong spark plugs because they cant be gapped properly, just stick with OEM autolite or NGK

 

I went down this road.. while trying to troubleshoot another dodge issue.. and what i found is they are all about the same brand to brand.. and really.. they all work about the same.. overall.. I would not go with any dual/spit, or quad fire plugs.. junk and a waste of time.. gimmick.. to steal your money.. as with some of those $10 plugs mentioned above..

 

like i said i use the NGK plugs that cost two buck each so 16 bucks for the whole motor and it runs perfect

 

And Champion's are still made in the USA..

 

I put NGK’s in my 4.7 just to see if they made any difference compared to the OE Champions. No difference except they cost more.
Forget the multiple electrode crap like Bosch (bosh) 2 & 4 electrode plugs. The extra electrodes only serve to shield the spark from the mixture.
As to platinum, you’ll get all kinds of opinions. Generally, I think since the plugs on this engine are easy to access, I’d stay with copper. There are reasons the engineers didn’t specify platinum and then advertise 100,000 mile tune-ups.

 

what would be the best plug to put into a 3.9L V6??