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3. Once we got the engine to run (not necessarily idle, though), we revved it for a few minutes to loosen up any junk in the engine before changing the oil. The tar-looking substance that came out was disgusting. Before putting on the new AC-Delco PF25 oil filter, we primed it by adding a quart of oil. If you do this, the engine will have oil pressure immediately on engine startup. View Related Article
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