Quote Originally Posted by Fatboy 18 View Post
Whats the spark plugs going to tell me?
If you pull out all 10, and a couple of them are oil fouled (black, or have oil on them) then you found which cylinders potentially have bad rings.

Quote Originally Posted by SlowPoke McGee View Post
Could be valve seals/guides too. But yeah this don't sound good. Would be curious how much air you have coming out when you remove oil filler compared to a similar Viper when revving up at neutral.
If that were the case he would more than likely have a nice cloud of white smoke every time he starts the car after it sits for a few hours. And if he was putting that much air into the valve covers to force oil through the seals/guides, he'd be collecting a fair amount in his can. It's going to be rings