What can oil catch can do?

[sars]

What can oil catch can do and what can I benefit from it?

Thanks.

[SeriesIIGTST]

Basically it stops engine blow by from entering your intake system. Most engines will get some blow by as part of normal driving but not a lot to worry about. However, as the engine grows more tired and the rings start to wear, more blow by gets produced and the catch can will simply "catch" this oil and continue to let the air re-circulate without the oil in it. It's a preventative thing rather than a performance mod.

[GTRgeoff]

usually for emissions you have to have the crankcase breather plumbed back into the intake, and this will carry the gasses that have forced past the rings into your intake charge including the atomised oil floating around.

OIL CAN CAUSE DETONATION and if you are running more boost you may experience some heartbreak if your engine is a bit tired. Mine blew a compressor seal which induced detonation at high load on a hot day and cracked 4 pistons. It was obvious immediately due to the oil smoke but after the seal recovered somewhat and I traced the fault in the turbo it took another 2000km to really show itself as failed pistons. Even though it was caused by the turbo I now run a catch can to protect against oil induction.