Oil Catch Can Kit for 2016+ SkyActiv Turbo 2.5L

When you think of a performance aftermarket component you typically think of a part that increases the vehicle’s power, but some performance parts don’t. Instead, they have a more critical purpose, increasing the reliability of your performance engine and components.  The CorkSport Oil Catch Can Kit (OCC Kit) is just that type of component(s). 

CNC machined Mazda Oil Catch Can

Why is an Oil Catch Can Kit critical for your Mazda?  Despite the huge advancement Gasoline Direct Injection (GDI) technology there are still some downfalls.  Compared to the more conventional port injection fuel systems, GDI is much more prone to engine oil fuel dilution.  This is primarily due GDI injecting directly into the cylinder; in low speed operation and cold starts the fuel simply does not have enough time to fully atomize into a gas before ignition.  This results in some excess fuel seeping past the piston rings into the oil along with any combustion chamber blow by the pistons.  This is fuel dilution. 

OCC catch all the nasty build up from entering your Mazda Skyactiv engine

Here you can see the results of a CorkSport OCC installed for ~3000 miles on a 2018 Mazda 6 2.5T.  This engine only has 500 miles and has an average commute of 15 miles & 20 minutes of mixed traffic and speeds. 

Mazda’s OE design attempts to resolve some of this with a valve cover breather that vents directly into the turbocharger compressor inlet and a PCV (Positive Crankcase Ventilation) valve in the engine block that vents to the intake manifold. 

How the Mazda OCC works

Mazda’s setup depends on the fuel and water vapor inside the crankcase being drawn into the intake manifold and intake system to then be re-ingested by the engine.  This has two major flaws:

  1. The direct crankcase ventilation via the PCV valve only works while cruising (no boost).  Combustion gas blow by will occur most often while in boost under high throttle application when the PCV valve is closed.
  2. This forces the engine to re-ingest dirty air that carries contaminants in the form of fuel and water vapor along with carbon debris.  These containments then build up on the inside of the intake manifold, cylinder head runners, and the intake valves slowly degrading performance over time. 
Carbon build up on a Mazda engine without the catch can

The CorkSport OCC Kit provides you with two major features:

  1. Both the valve cover vent and the PCV valve are drawn from the turbo inlet directly ahead of the turbocharger compressor. Thus both the valve cover and PCV valve have constant vacuum in all driving conditions, both cruising and high throttle application.
  2. The oil catch can itself acts as a “filter” for the vapor and debris that would normally be directly ingested by the engine. The drawn crankcase vapor and debris is separates and collects in the catch can for easy removal during normal oil changes. 

As you saw above, there is a significant amount of vapor and fine debris that is being filtered out of the crankcase air that would have normally been ingested.  As you continue down the path of modifying and demanding more form your Mazda, the need for a OCC System only becomes more and more critical. 

Bolt on Mazda Cx5, Cx9, and Mazda 6 turbo

Connect with us

You may also like

Stay up-to-date on the latest news and product updates from CorkSport.

* indicates required

15 Replies to “Oil Catch Can Kit for 2016+ SkyActiv Turbo 2.5L”

  1. I’d like to purchase and install this OCC on my 2018 CX-9. On the website, the OCC is listed for use only with the 14-18 Mazda3 and the 13-17 Mazda6. Are the installation instructions different for the CX-9? If they are, where can I find installation instructions for the CX-9?

  2. I don’t see this kit listed under any of the vehicles with the 2.5T engine (CX-9, CX-5 or M6). When will it be available for sale?

  3. I got the kit for 2018 CX-9. There is a subframe that prevents the OCC from mounting to the frame at all. Was the kit test installed on the 2016+ Cx-9? Issue sent over to support .

  4. I have a 2019 CX 5 turbo (GT Reserve). Will the installation of the CorkSport catch can involve removal of the front bumper cover as illustrated here?
    I’m hoping that photo is merely to illustrate the position of the catch can.

  5. Was this kit test fitted on the 2.5T CX-9? I’d like to buy one but need verification due to the comment about the subframe issue.

  6. Hi, do you have installation instructions for the Non turbo skyactiv variants 2016 CX5 Etc. Also I live in New England, it can be below freezing from late dec-feb. What strategy can be used for operating a catch can in those temps? Or just make sure it’s not full during those months?

Leave a Reply

Your email address will not be published. Required fields are marked *