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In some performance car circles a separator is considered an enhancement, adding "catch cans" to their crankcase emissions system.
Apparently, oil vapour entering the combustion chamber can be detrimental to performance and fuel economy.
Zongshen didn't have to add this separator to pass emission standards, a straight forward tube will do that.
Blow-by gasses also contain acids that I guess wouldn't be good for the EFI sensors.
Perhaps these are the reasons its been added.
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