Radium Air Oil Separator

Radium Air Oil Separator

High-powered modified Subaru engines tend to generate excessive blow-by oil and gasses. In these cases, an ordinary small catch can may quickly fill with oil and not be adequate. The Radium Engineering Subaru  AOS (Air Oil Separator) kit is responsible for keeping blow-by oil and other pollutants out of the intake pipe, manifold, turbocharger, and intercooler during all engine loads. The main difference is that an AOS system returns what is collected back into the oil pan so there is no servicing required. The built-in heater keep water from condensing in the AOS, making sure ONLY oil is returned back to the oil pan, not a milky sludge.


-Effectively raises the octane and increases engine performance with cleaner inlet air 
-Prevents oil buildup in the intake or intercooler system walls, throttle body, intake manifold, etc. 
-Lowers hydrocarbon emissions


What is included?
-Machined alumium Radium Engineering Air Oil Separator
-Specially designed mounting bracket (see note at bottom of page)
-All necessary SAE J30R7 rated PCV/Emissions hose
-Coolant hoses and fittings
-All necessary aluminum fittings and hose-ends
-Stainless steel mounting hardware 



02-07 Impreza WRX
02-07 Impreza WRX STi
04-08 Forester XT
05-06 Saab 9-2X Aero

08-14 Impreza WRX
08-14 Impreza WRX STi
2015+ Subaru STi


*For 02-05 Subarus with a cable-actuated throttle body, a Cruise Control Relocation Bracket must be used unless your cruise control has been deleted.  This bracket is $30 and can selected as an option for this models.


Installation instructions are available here: http://data.radiumauto.com/PublicDocs/19-0102C.PDF