hey guys, thanks for the posts. I was in a discussion on another site about whether to circulate the oil before starting the engine, after an oil and filter change. The discussion wasn,t turbo specific. But the turbo question did come up. One mechanic said, he only circulates the oil on forced induction systems, not the rest. Another mechanic said, you don,t need to do that even on turbos. He states that there is enough residual oil left in the turbo, so it won,t hurt anything as long as you don,t race the engine on start-up. Tech info says under normal conditions, most engine wear occurs at start-up. The mechanic said that the possiblity of engine damage is higher at cranking rpms than running. For myself, if I have to deal with no oil pressure, even for a couple of seconds while the oil circulates, then I would rather do it at cranking rpms than running rpms. I think alot depends on your rpms at start-up, meaning engine running rpms. Those start-up rpms is one reason you should get your engine good and hot before draining oil. If you have a carburetor with a choke, you don,t won,t the fast idle system to come into play on start-up, that could be 2K rpms or better. For myself,I don,t like to get the oil that hot, can,t handle the plug, plus the hot oil running down my arm. As far as a horizontal filter, go ahead an fill it with oil, let it set while you drain the oil, when you get ready for the filter, just pour the access oil in the engine there will still be quite a bit of oil in the filter element, every little bit helps. Does your owners manual or shop manual recommend circulating the oil before starting? great site, thanks for your replys. PS Do you consider engine start-up to mean cranking rpms---running rpms---or both--- to me it means running. thanks
