What is and oil catch can?
How does it work?
Do I need one?
For every piston stroke in a combustion engine, there are exhaust gases which flow between the piston rings and sleeves. These gases enter into the crankcase. In turbo-charged engine applications, air can also make its way into the crankcase through the oil return pipe of the turbo-charger. These gases are generally called blow-by gases.
The pressure they create lead to unacceptable “pressure build-up” and crankcase ventilation then becomes necessary.
In many countries, regulations stipulate that the crankcase ventilation must not enter the atmosphere. For this reason, blow-by gases from car engines are redirected by a closed loop crank-case ventilation system, back to the intake pipe assembly and burned.
Great in theory, but this is where the problem starts.
These gases carry oil vapour, and this oil vapour goes straight back into the intake system. The oil coats the intake hoses, inter-cooler, throttle body, intake manifold and inlet valves with oil. This oil film will eventually cause a carbon build up through the intake system and EGR valve, which will rob the engine of performance. Eventually you will get driveability issues and then this will turn into a costly repair.
So… To fix the problem, we fit an Oil Catch Can. The Oil Catch Can, well…… catches the oil… Hence, its name.
The Oil Catch Can filters the gases, separates the oil and stops the oil travelling back through the intake system.
After explaining this problem, and then the fix, the MOST commonly asked question is WHY? If this is such a problem, why don’t the manufactures fit it to new vehicles?
Well, there are only two reasons.
1. It costs money.
2. By the time you know there’s a problem, the vehicle will most likely be out of warranty.
SO, my advice is to fit an Oil Catch Can. ASAP.