Simply so, do oil catch cans need a breather?
Some catch cans simply have one line coming from the crankcase to the can and then use a small breather filter to allow pressure to vent out of the top of the can. This vacuum helps clear oil and, more importantly fuel vapors, from the crankcase faster.
Furthermore, what makes a good oil catch can? It does not have to be made of aluminum, but as much as it is lightweight, it should be high quality. The materials used should make a strong and durable can. Therefore, on the construction of the oil catch can, you look at the quality of material used, its strength, durability, and lightweight.
Keeping this in view, why do catch cans have filters?
Catch cans or oil separators are efficient methods of cleaning the blow by gas, before it gets re-circulated through your motor, and can significantly reduce the build up of oil and carbon in your motor. The oil is separated from the gas in the filtration process and clean air is fed back through the motor.
Do oil catch cans actually work?
The answer is yes. While a catch can won't stop every last particle of contaminant from entering the intake manifold and coating the valves in a direct-injection engine, the less unwanted buildup the better. For those who don't want to empty out a tiny catch can frequently, the larger units are helpful.
