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Modern engines meet emissions requirements by routing crankcase vapors back through the intake. Those vapors often carry oil mist, fuel residue, and condensation. Over time, that mix can leave an oily film in intake plumbing, coat throttle bodies and sensors, and contribute to intake-valve deposits on direct-injection platforms. A J&L Oil Separator adds a filtration step that keeps much of that contamination out of the intake stream. The valu...