N54 Spark Plug Change and Odd looking Cyl 1 plug

I changed my plugs on my 335 Saturday and all went smoothly except for Cylinder #1 . Just loosening the plug was an MF'er and the plug looked very different from the other 5 plugs. It was darker and had noticeable carbon build up on the electrodes and even right before the lower threads (probably why it was so hard to get off).


I need any experience or expert opinions on why the Cylinder #1 plug looks so different. Cylinder #6 plug was a bit darker as well, but not like #1 .


I am FBO with BB (BMS) Backend Pump Flash G5 ISO on Map 5. No E85


Let me know what you guys think.




All plugs Cyl 1 thru 6 (left to right)







Cylinder 1 plug up close





All plugs again