Oil catch can - Page 3 - Alfa Romeo Forum
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Aos what is that ? Please
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Air Oil Separator I think is what it stands for. On the 2.4 I believe its at the back of the engine that you'll find by following the black metal pipe that passes over the top of the engine. There are also one or two other pipes coming out of it.

And thank you Joomoo for the reply.
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AOS is an air oil separator as above. Does a similar job to the oil catch can, but rather than catch and hold the separated oil it drains back into the oil sump.
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