The idea is to reduce or prevent engine oil from entering the intake manifold. Combined with the soot from the EGR system, it can create a gluggy mess that clogs the intake. Engine oil will also coat the inner surface of your intercooler reducing its performance.
It comes from the crankcase. As combustion occurs, a little of the gas produced slips past the piston rings (that's why the gaps in the rings need to be offset) into the crankcase. This pressurises the crankcase - and the "PCV" - Positive Crankcase Ventilation" - allows the excess gas to flow out.
Unfortunately, because the combustion gas is hot, it tends to vaporise the engine oil, which is passed out of the PCV along with the combustion gas.
So that's where it comes from and why it's beneficial to 'catch' it.
More than likely, but simple to remove if needed.would fitting a catch can void any engine warrantee on a near new vehicle such as mine 2014 with 12k on the clock ?
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