I recently purchased a borescope and have been playing around with it. I snagged a pair of pictures of my '05 Impala through the fill hole. I also got a picture of my '17 Elantra, but it is nothing out of the ordinary. Clean as any new car should be. I did notice that the Impala was pretty clean, with a bit of varnish on the valve cover. I'm curious as to why it would build up there but not down below. Anyways, I don't think it looks too bad for a 12 year old, 124k mile vehicle. What say you?