An Oil Catch Can is a valuable aftermarket device installed in the crankcase ventilation system of an internal combustion engine. Its primary function is to capture oil vapor and other contaminants that are expelled from the crankcase during the combustion process, preventing them from re-entering the intake manifold and causing performance issues. Oil Catch Cans are particularly beneficial in high-performance Oil Catch Can and turbocharged engines, where increased pressure and temperature can exacerbate the problem of oil contamination.
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The crankcase ventilation system is designed to relieve pressure buildup within the engine by allowing blow-by gases—combustion gases that escape past the piston rings—to exit the crankcase. These gases contain a mixture of air, fuel, and oil vapor, which, if left unchecked, can lead to the formation of sludge and carbon deposits in the intake manifold, throttle body, and intake valves. Over time, this buildup can reduce engine efficiency, increase emissions, and cause drivability problems.