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The main difference is that an AOS system returns what is collected back into the oil pan (as shown below) so there is no servicing required
Easy to mount via 2 bolt holes
Mk3 NC (2005-2015)
 AEM 50-1200
a wideband controller and a state-of-the art engine management system in one powerful device we call a VCU (Vehicle Control Unit)
Radium Pcv Valve 10An Orb To 6An Male Radium Fuel Surge Tank Installation Kit Bmw E46 The main difference is thatÂRadium Engineering valve for PCV (positive crankcase ventilation) systems. Do not mistake this for a simple one way check valve. The PCV valve's internal plunger dynamically meters the appropriate amount of crankcase vent airflow based on current engine load. Proper PCV valves prevent the "vacuum leak" that a check valve would create at low loads. Also, in the event of a backfire, the PCV valve prevents combustible vapors from igniting in the