Oil in Cylinder #7?!

[Russell]

Ok, as many of you know, my truck hasn't been running at all the past little while, anyways, I have a noisy lifter on the driver's side, and I am thinking that it is #7, so I pulled the plugs to do a compression test to make sure that my valve in there is still closing, All the plugs I pulled were the usual carbon covered, but this one had liquid all over it, when I wiped some on my finger, and it smelt and looked like engine oil... The truck has always had some weird smell to it when I first started it, and the exhaust has always been a bluish color, do you guys think that maybe a seal in there is damaged causing the oil to seep in, as well as causing the lifter to be noisy? I didn't want to stick my compression tester on there becuase I don't want to get it full of oil, but when I tested it beforehand it was at 120 PSI like all the rest of the cylinders...