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 and turbocharged engines, where increased pressure and temperature can exacerbate the problem of oil contamination.