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A catch can is necessary to to prevent oil from entering the intake and causing plug fouling or detonation on car that are worn out, have been set up loosely to reduce friction for racing or have ultra high compression or boost that causes leakage past the rings on the power stroke and pressurizes the crankcase resulting in accumulation of oil and gasses that are vented into he intake system.....A catch can allows the gasses to enter he intake but retains the oil..... I used to do the same thing on old air cooled VWs with an empty beer can at first but found that small Mason jar worked better.
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