Quote:
Originally Posted by Jeff86
Crankcase blow-by is vapor. It is a small amount of unburned fuel and exhaust gasses. It's not going to create or contribute to an oil slick in any significant way. That's why people are asking how these cans are baffled in order to actually separate material out of this vapor. It's more of an atmospheric pollutant and is far less significant than everyone who runs around with a turbo system with catalytic removed. This is, however, why I said "Obviously if you're worried about being environmentally friendly you don't do this."
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My catch can stops all the oil from getting through as it's filtered. The oil drains down into a pipe with a tap at the end which I drain on a regular basis. It also has a relief valve in case the filter gets blocked but that hasn't happened after over 40,000km and I should replace the filter at this stage.
The stuff that comes out is dark acidic oil and not very pleasant.
I use a catch can because I don't want this stuff all over the compressor wheel, filling up the intercooler, clogging the inlet manifolds and burning in the cylinders.
I agree that leaving out the cat is a really bad thing to do and stinks for anyone following but I was talking about dropping oil on the road and reducing the braking distance for others wherever you go.