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New trucks and performance cars leave the factory with a clean intake and sealed PCV system. As mileage builds, blow-by sends oil mist and fuel vapors back through the intake, slowly dragging performance down. An oil separator for vehicle protection is a simple way to control that buildup, but many owners hesitate due to warranty and emissions rules. A J&L Oil Separator is built around those concerns. Each kit is closed-loop, uses OEM-style h...