Oil Catch Can
An oil catch can is a container fitted in the crankcase ventilation line that collects oil mist before it reaches the intake.
What is Oil Catch Can?
It is popular on direct-injection engines where oil deposits can build up on intake valves. The collected oil and water must be emptied regularly. Some factory engines already have efficient oil separators. Whether a catch can is useful depends on the engine; some benefit clearly, others show little difference. It should be a closed system that returns gases to the intake.
How it works
Blow-by gases pass through the can, where baffles slow them so oil droplets condense and drop out.
Why it matters for your car
Aftermarket catch cans may not be road legal in every country if they vent to the atmosphere. A full or frozen can could block crankcase ventilation.
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