Spotted this at my mech's garage when I went there a couple of years ago and I thought this was worth a couple of photos. This is an Allion which was owned by a person who thought that his car could be driven forever with just topping up his tank. Sharing to stress the importance of routine engine maintenance (oil changes especially): Yes, the metal plate on the right has all the sludge that was removed from the engine cover. As the others have stated, just change your oil on time, and this will not happen.