I'm talking about over the long haul. Some of the examples I've seen were: My cousins Dave 94 Camry with 150k.3k OCI's with Penzoil and Frams.Very clean under the valve cover with a light yellow tinge on the metal.No consumption. I lot of my old mans cars were pretty clean with nothing but dino changes. My boss's 4.3L S10,10W30 OCI's and reallt clean.Close to 150K. What are your experiences?