Roo Systems has designed and created a universal oil/ air separator to operate as a catch can for your 4WD vehicle. The separator can be adapted to most diesel vehicles. It reduces or eliminates oily fumes that can contaminate the intake system. This translated into more efficient cooling and better power delivery.
Roo Systems oil catch cans do an excellent job of filtering out the oil from the crankcase gasses that are re-entering the engine through the factory set up and they do this without restricting flow.
Keeping the oil out of the air intake will benefit in 2 ways. Firstly, oil mist in the air intake entering the combustion chamber will reduce the octane rating of the combustible fuel, mainly in petrol engines, this leads to a symptom called pre-ignition. Pre-ignition is one the quickest way to damage cylinder heads, piston crowns and piston rings.
Secondly (and the main reason) oil entering not the intake manifold combines with the heated gases f the exhaust gas recirculation (EGR) (300-400deg Cel) and literally bakes to form carbon build up in the manifold. This carbon builds up over a relatively short period restricts the volume of air hat would normally be allowed to flow through the manifold into the combustion chamber. The less flow, the less performance and fuel economy.