I actually have two questions, the first is, I just replaced my spark plugs less than a week ago, I ended up switching the offroad pipe back on for a little while and I needed to loosen up my header bolts to do it, so I pulled a couple of spark plugs so I could get at the bolts. When I got them out I noticed that there was oil on the threads of them. None on the plug itself, just on the threads, is this normal? Also, the back plug on the drivers side goes in about 2 full turns less than the other plugs and then it's tight, is this normal or should I go buy a tap and tap out the hole?