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Firstly, if it is all oil, Houston: we have a problem. The purpose of a catch can is to catch blowby, moisture, unburnt fuel, etc. My first question is have you tracked it? Or, drove it like you stole it every weekend?
Of course, it also matters what kind of cc, how is it plumbed, what is it catching? I've read as low as 1/2 ounce and as much as 10 ounces per 1k. But the latter is invariably tracked (or driven as if so) per 1k. Bottom line is, you generally want all that stuff out of your engine.
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