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The Chevy Silverado and GMC Sierra are built to work, but even strong 5.3L and 6.2L EcoTec3 engines are subject to crankcase pressure and blow-by. Pressure in the crankcase can push past seals, carry oil into the intake, and chip away at performance and reliability over time. Understanding Silverado crankcase pressure makes it easier to spot early warnings and address them before they turn into leaks, carbon buildup, or major repairs. What Is Cra...