Originally Posted by jhawk
I paid $42.00 for 16 plugs. Changed them myself. Pretty easy, and I am no mechanic
EXACTLY, it's simple and easy and you should be able to find the copper plugs for ~$2.00 each * 16 = $32
Oh, BTW, in a stock motor NO spark plug will give you more power or more fuel economy so the ONLY reason would be for extended life. BUT, if you get 3 times the service but the plugs cost 3 times as much your even.
A quick search on the net seems to show that many have used the platinum's on Dodge 5.7's without issue and that should push the interval to 100K. They also say to stay away from iridium (thin wire).