I'm new to the forum, but have been reading a lot and learned a lot. The infamous spark plug problem had me worried but heard that 2008 had been redesigned. Learned that if your 5.4 motor has a build date later than 10/12/2007 and a code of BB, then you have the new design. This info is located on the valve cover on the driver side. I have 14k miles on my 2008 KR and was curious, so I removed one plug and thought I'd take some pics and post it here. These are platinum and I have a feeling that I'll be changing at around 90k or even 100k without worry.