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Many components of the engine, including the oil pan, valve cover, and front cover are sealed together with silicone. It's important to use the right product, and Dmitri always uses what came from the factory—GM Engine Sealant (PN 12378521). If you're good, it takes one 5.3-ounce tube to do an engine. Make sure not to lay down too thick of a bead or you'll risk clogging your Duramax's oil supply with chunks of silicone.