Well to start off I'm an old fart and wouldn't even know where to find the sparks without this site. Decided to change the spark plugs, air filter and the serpentine belt. T he vehicle has 154976 miles on it and this is the first rplacement of plugs and belt. I surprised myself in only taking about 20 minuets to change the belt and about 2 hours on the others including a test drive. Everything went great since I got all the info to do this here first. Plug 6 was the hardest and I also removed the throttle body and cleaned. I do have a question for you experts. Plugs 4 and 6 had what looked to be oil on the threads and electros. The color was almost like a brite copper. The other plugs had this on the threads but not the electros. The other plugs were a nice dry light sand color, all the old plugs gaps were right at about .043 although a lot thinner. The old plugs were ACDELCO 41-981 and I installed the ACDELCO 41-103's. So what do you think about the oil on the plugs?