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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...

Modern engines meet tight emissions targets, but they still vent oil-laden crankcase gases back into the intake. Over time, that vapor coats valves, intercooler fins, and spark-plug electrodes. A catch can—more accurately referred to as an oil separator—captures the mist before it turns to sludge. Below, you'll find five clear signals that a factory-fresh daily driver can benefit from this small, preventive upgrade. Stock car oil sepa...