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A catch can is always good, but the oily vapours getting routed to the intake tract might not be much a matter of concern, as long as they don't condensate so easily or don't get mixed with particulate matter from the EGR. But I guess you know, the particulate matter issue is more of a problem with Diesels or direct-injection gassers. In a regular gasser with a carburettor or a more conventional injection, the oily vapour will be dilluted by the air-fuel mixture and burn easily. Oil droplets OTOH may stick to the intake manifold, and any other residues sticking to it will be much of a PITA.
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