The ignition system on your 4.0 is a waste spark (1 coil pack for all 6 cylinders). Keep an eye on plug life span even with the iridiums, as one bank will eat the ground strap. Both the ground strap and center electrode need to be either platinum or iridium. I have found the (cough) Autolite double platinums actually have the best life in a Ford waste spark setup. My Ranger has at least 80k on the double platinums and still have plenty of life on them.
Oil for slightly neglected ford explorer 4L sohc
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