I will post pics in the morning. My wife normally drives the car. She said it needed plugs due to a slight miss. I kinda chuckled (due to having 15,000 miles and went and bought new plugs for it. Well I pulled all the plugs and about s*** myself when I pulled the two plugs on passenger rear. Carbon buildup so bad on one that it closed the gap on one and nearly On the other. I couldn't believe it. The car had a tick since we bought it before I changed the plugs from that side rear and is now gone with plug change which tells me it was carbon knock. Also I searched the tick before on the forum and thought it was due to noisy injectors so never worried about it.

Has anyone experienced this?

Bad gas?
No good plug from factory?
It is definitely carbon buildup.

Also while changing the plugs I noticed oil on the lower plastic engine cover. There is no oil on the valve covers. It was not leaking when I changed it last
because the was no oil on the pan. I 100% positive drain plug is tight.

Any help suggestions or comments would be great. I am going to keep an eye On those two plugs.