I pulled the valve cover off my 22RE toyota 4cylinder last weekend to replace the gasket and got my first look inside since 50k miles when I previously changed the gasket. Everything looked bright and shiny with a golden patina on most of the surfaces. the engine still looks new with no apparent wear on the cam lobes. I have been running synthetic since the 1st change and amsoil with a bypass since 13k miles. It is now at 110k. Yes, I took pictures but had to settle for using my new palm Zire 71 camera as I did not have my fuji with me. My question is. Could those of you who have been using a non synthetic for over 100k miles please tell me what it looked like under the valve cover or covers. I am especially interested in newer cars which might be more prone to sludging. Not being a mechanic, I don't have access to the insides of a large sample of cars with which to compare. As an aside, I did talk to a mechanic pumping gas at a local gas station and he himself ran Mobil synthetics front to rear on his own truck. He told me that the engines that were using Penzoil had a lot of sludge in them. Any comments from any mechanics out there?