Oil Catch Cans & Breather Tanks

Oil catch cans and breather tanks look similar and do similar jobs, but they serve different purposes.

Oil Catch Cans

Normally, the PCV (positive crankcase ventilation)...

Oil catch cans and breather tanks look similar and do similar jobs, but they serve different purposes.

Oil Catch Cans

Normally, the PCV (positive crankcase ventilation) valve uses intake vacuum to relieve the pressure inside your crankcase, but that can result in oil mist and other blow-by contaminants building up on the valve and pistons, especially in direct-injection engines. An oil catch can (sometimes called an air/oil separator) is installed between the PCV valve and the intake, where it removes contaminants and allows only clean air to return to the intake manifold. Some have a reservoir that needs to be drained...

Oil catch cans and breather tanks look similar and do similar jobs, but they serve different purposes.

Oil Catch Cans

Breather Tanks

In forced induction and racing applications, the build-up of crankcase pressure can be much greater, so a breather tank is designed to vent that excess pressure into the atmosphere. They capture some blow-by with a catch can and air filter, and they may have an oil return. Importantly, breather tanks may not meet local emissions standards.

Top Brands

These devices are easy insurance for your high performance engine, and some builders use both a catch can and a breather tank. Summit Racing Equipment carries catch cans from trusted brands like Moroso, Mishimoto, Canton Racing, Ford Performance, JLT Performance, and many more.

Individual Parts

Part Groups

Results 1 - 11 of 11

Radium Engineering Catch Can Kits 200772

Air Oil Separator-Return Dual, PCV, Crankcase, 7 oz. Capacity, -6 AN, Billet Aluminum, Black, Honda, S2000, Kit

Part Number: RDM-200772

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Summit Racing™ Ultimate Oil Separators and Catch Cans SUM-300151

Ultimate Catch Can Assembly, Billet Aluminum, Black, External Ventilated, High Capacity, Each

Part Number: SUM-300151

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Radium Engineering Catch Can Kits for 2000-2005 S2000 - 20-0093-FL

Air Oil Separator-Return, PCV, 7 oz. Capacity, -6 AN, Billet Aluminum, Black, Honda, S2000, Kit

Part Number: RDM-20-0093-FL

Not Yet Reviewed

Estimated Ship Date: Jul 24, 2025 if ordered today

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Estimated Ship Date: Jul 24, 2025 if ordered today

Radium Engineering Catch Can Kits for 2002-2007 IMPREZA - 20-0207-02

Air Oil Separator Kit 02-07 Subaru WRX STI

Part Number: RDM-20-0207-02

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Estimated Ship Date: Jul 24, 2025 if ordered today

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Estimated Ship Date: Jul 24, 2025 if ordered today

Radium Engineering Catch Can Kits for 2015-2017 WRX - 20-0258-00

Air Oil Separator Kit (INCLUDES 20-0255) 2015+ Subaru WRX

Part Number: RDM-20-0258-00

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Estimated Ship Date: Jul 24, 2025 if ordered today

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Estimated Ship Date: Jul 24, 2025 if ordered today

Radium Engineering Catch Can Kits for 2017 86, 2013-2017 BRZ, 2013-2016 FR-S - 20-0351

Air Oil Separator-Return Kit 2013+ Subaru BRZ / Scion FR-S

Part Number: RDM-20-0351

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Estimated Ship Date: Jul 25, 2025 if ordered today

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Estimated Ship Date: Jul 25, 2025 if ordered today

Radium Engineering Catch Can Kits for 2000-2005 S2000 - 20-0096-FL

Air Oil Separator-Return, Crankcase, 7 oz. Capacity, -6 AN, Billet Aluminum, Black, Honda, S2000, Kit

Part Number: RDM-20-0096-FL

Not Yet Reviewed

Estimated Ship Date: Jul 28, 2025 if ordered today

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Estimated Ship Date: Jul 28, 2025 if ordered today

Radium Engineering Catch Can Kits for 2015-2020 WRX STI - 20-0607

Air Oil Separator-Return Kit 2015+ Subaru STi

Part Number: RDM-20-0607

Not Yet Reviewed

Estimated Ship Date: Jul 28, 2025 if ordered today

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Estimated Ship Date: Jul 28, 2025 if ordered today

Radium Engineering Catch Can Kits for 1997-2004 CORVETTE - 20-0260-FL

Radium Engineering Catch Can Kit GM LS Engine Fluid Lock

Part Number: RDM-20-0260-FL

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

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Radium Engineering Catch Can Kits 20-0008-FL

Universal Catch Can, 7 oz. Capacity, -10 AN O-Ring, Billet Aluminum, Black, Each

Part Number: RDM-20-0008-FL

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Summit Racing™ Ultimate Oil Separators and Catch Cans SUM-300150

Ultimate Catch Can Assembly, Billet Aluminum, Black, External Ventilated, Standard Capacity, Each

Part Number: SUM-300150

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