Radium Catch Can Kit, BMW E46 M3, Fluid LockRadium Catch Can Kit BMW E46 M3 (Fluid Lock) An oil catch can is essential on any performance vehicle to protect the engine from elevated crankcase blow by accumulated during aggressive driving. Excess oil saturated air circulating back into the intake stream degrades performance, contaminates the throttle body and intake manifold, and can mask early signs of engine wear. The Radium Engineering Catch Can Kit for the BMW E46 M3 solves this with a