I am approaching the 30,000 mile service interval on my 2004 DC Tundra with the 2UZ-FE engine (V-8). My manual states that the plugs have to be changed or it will void the emmisions warranty. Fine, I can do that myself. I won't pay 285.00 for the dealer to replace them as it is a fairly easy job. It looks like removing the coils one at a time, check the gap (unless they are irridium or platinum) , a little anti-seize and the proper torque and I'm good to go. The trouble is the plug selection. One part of my owner's manual states that the truck came equipped with platinum plugs and should not need replacing until 50 or 60K miles. The specification section states that the replacement plug is an NGK BKR6EYA, which is a standard plug with a v-groove set up, not platinum or irridium. I have a list of replacement plugs ranging from a standard plug to expensive irridium plugs, but am not sure which to buy. I have a dealership close to me, but I don't trust them. So my question is, which plugs should I use? Am I going to do any damage to my truck by installing the more expensive platinum or irridium plugs, and if not, will I benefit from them over the stock plug?