Air and Fuel› Superchargers, Turbochargers and Components

COBB Tuning

Redline Series Oil Catch Can

$430.00

SKU: 891610

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Overview

The COBB Air/Oil Separator is designed for the 2013-2018 Ford Focus ST. It integrates into the crankcase ventilation system to prevent oil vapors from entering the intake.

The system forces crankcase air through a swirl pot and baffles, causing oil particles to condense and collect. A drain line then returns this collected oil to the crankcase.
Show original supplier description
It effectively captures oil vapors that would otherwise enter the intake manifold. This process leads to cleaner valves and a reduced likelihood of detonation, as oil particles are removed from the PCV gases before they reach the intake. Constructed with a spacer plate made from 33% glass-filled nylon, this AOS integrates seamlessly with the factory breather plate. Air from the crankcase is routed through a swirl pot and baffles, causing heavier oil particles to condense. This collected oil is then returned to the crankcase via a dedicated drain line, ensuring a cleaner engine and potentially allowing for more power with reduced risk. Installation of this Air/Oil Separator requires the COBB Sound Symposer Delete Kit, which must be purchased separately. The AOS itself features a billet aluminum tank with bright black dip anodizing, additional baffling, and a laser-etched COBB logo. It is designed and manufactured 100% in-house by COBB Tuning. This specific Air/Oil Separator is confirmed to fit various Ford Focus ST models from 2013 through 2018, including ADM, EDM, and USDM configurations. It is also noted as being 50 State Legal with California Air Resources Board (CARB) Executive Order (EO) number D-660-123.
Vehicle Symptoms
  • Excessive oil consumption between changes
  • Rough idle or hesitation at stoplights
  • Loss of power during acceleration
  • Carbon buildup on intake valves causing misfires
  • Check Engine Light for lean condition (P0171)
Relevant Conversations
  • Focus ST rough idle after cold start fix
  • COBB air oil separator Focus ST review
  • P0171 Focus ST oil in intake causes
  • Best catch can for 2013 Focus ST
  • How to install COBB AOS on Focus ST
  • Focus ST carbon cleaning vs catch can
  • AOS vs catch can for direct injection
  • Focus ST misfire P0300 carbon buildup
  • COBB 891610 oil separator worth it
  • Focus ST oil consumption problem solved

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandCOBB Tuning
Part Number891610
CategoryAir and Fuel
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(760) 282-4645 hello@motormia.co

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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