Oil catch tank, collects oil and oil sludge from the crankcase

Orange/yellow Sludge in Oil Fill Stem and Cap

Sludge in head/engine what to do?

An oil catch tank/ can is used in turbo applications, or high-performance racing applications where excessive blow-by (leakage past the piston rings)

Oil Catch Can Reservoir Baffled Tank Breather Filter Universal Black Fits Lexus

Titan TMS Oil Catch Can

IAG V3 Street Series AOS (Red) The IAG Performance V3 Street Series Air / Oil separator (AOS) is an excellent investment to keep your Subaru vehicle running well. The Street Series AOS maintains OEM PCV system functionality, but supplements its capacity. The Street Series AOS design is based on years of extensive testing on standard and competition applications.

IAG Air / Oil Separator (AOS) for 2008-14 Subaru Impreza WRX & 2008-21 STI - Neon Yellow

Baffled Oil Catch Can Kit Reservoir Tank with Breather Filter

Universal Aluminium Car Baffled Engine Oil Catch Can 0.75l High

11-14 Mustang GT TVS Plug N Play ™ Firewall Mount Oil Catch Can

PLM Billet Oil Catch Can 6.4L HEMI Dodge SRT 11-23 Challenger Charger

Forge Motorsport Oil Catch Tank MK5 GTI / MK6 Golf R