This is a page with some very good info regarding spark plugs.
I found it while searching for info on the plugs I use in my '99 5.2L.
BTW, I use the Bosch Platinum FR7DPX
It also looks as though they did some research on the DML.
http://brutus.rightpathnetworks.com/site08/repairlog/sparkplugs.htm
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