I was just checking my plugs and one had a little oil standing in the plug well. Just enough to soak the threads when I pulled it out. I ran my $10 dollar scope in the plug hole and saw where a fat drop or two dripped on the piston. Piston was kinda crusty with carbon. I assume this is a valve cover leak. 47000 miles. Looks like I'll be going to a stealership. Anybody else had this happen?