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During the process of venting crankcase pressure back through your intake track, large amounts of oil—in the form of vapors—surface in your intake tube and intake manifold runners. These vapors can even dilute your gas, lowering its octane level. This happens on all engines and is even worse with forced-induction vehicles (supercharged and turbocharged) as crankcase pressures are increased. To combat this, JLT Performance has developed an oil separator of the company’s own design. Milled from solid billet aluminum, this is a rock-solid piece. It has a knurled tank base for easy removal to drain the spent oil and an O-ring seal to prevent any leaks.