I have an '02 F4i and i just pulled the plugs for the wintertime. One of the plugs (the 3rd one from the left when looking from back to front) has oil on it. Not only that, but the coil had oil on it all the way up, and the boot on the coil sits very loose, possibly caused by the oil? Also, all my plugs are fouled, but they're the denso iridium one's so i figure they should last more than the 20k that i have on the bike. I'll post some pics of the plugs tomorrow when i change the oil to finish up my winter maintenance. But what could cause the oil on the plug/coil, and only one of them?