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Direct injection engines, were gamechangers, with one single drawback. What you should do to maintain its performance.

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Why would you need an oil catch can system on a modern direct-injection engine?

When OEM crankcase ventilation systems fail, they can allow excessive amounts of oil vapor to enter the intake manifold. This not only leads to intake valve contamination and poor sealing, but also contributes to a range of other issues.

Another common problem is oil vapor entering the combustion chamber, where it can foul spark plugs and affect piston ring sealing. This is not the type of outcome we want from a performance engine due to a compromised OEM emissions component.

To avoid these issues, installing a better-engineered crankcase ventilation solution—such as a dedicated oil catch can—can help maintain, and in some cases improve, performance, reliability, and engine longevity. That said, it is important to evaluate which system best suits your needs, as well as your local climate.

Some systems use one or two baffle plates, while others use a bronze micron filter. Be warned: in colder climates, certain catch cans can freeze during winter, potentially causing unwanted crankcase pressurization on startup until the system reaches operating temperature.

I chose the CTS Turbo oil catch can system for my Audi TT EA888 engine. First impressions were that the system is designed for optimal flow while still ensuring effective separation of oil vapor from air.

I was confident it would work well, but I was initially unsure how much blow-by it would collect or how quickly it would fill.

For maintenance, I use an adjustable AN fitting wrench and Allen key screwdriver to remove and drain the can. I then clean it with brake cleaner and rinse it lightly with water before reinstalling it.

During the August 20th service, the system collected nearly 8 ounces of blow-by and oil.

This naturally raises a few important questions:

Is a catch can system necessary?
A) No, it is not strictly necessary. However, if the longevity and performance of your vehicle are important to you, it is highly recommended.

How much did your setup cost?
A) Approximately $670–$750 CAD.

Is the CTS Turbo catch can system worth it compared to competitors?
I have not used other catch can systems, but the CTS Turbo unit is functional, well-designed, and worth every penny in terms of peace of mind.

Should modified cars use an oil catch can system?
A) If your vehicle is running increased boost pressure via software tuning or upgraded performance hardware, then a catch can system should be considered as part of the build.

Focusing solely on performance without ensuring the engine is properly protected under increased stress is not the most responsible approach. An oil catch can system helps maintain cleanliness and efficiency within the engine.

In that sense, it is similar to a big brake kit: is it necessary on a stock car? No. Is it necessary on a modified car? In most cases, yes.

Come back next week to see how much blow-by is collected. Stay tuned and stay boosted.

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