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It's not so much the oil you see under the lid, that same oil has also already coated your supercharger bricks making their cooling less efficient, and oil that already passed on to the top of your valves. It's true on a stock ZL1, a catch can matters less, but once you start modifying one of these cars to produce more boost, a catch can becomes a much better investment. Having a catch can with a vent is even more important to reduce crankcase pressure. There's literally no downside to using a catch can other than warranty concerns which depends on your dealer.
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