I've always wondered about the oil catch cans, and never had the patience to read the million word long threads on the subject.
someone want to give me a one liner whether they are necessary or not and why?
here is why Reduce Sludge.
In your Mustang's engine, crankcase exhaust is re-circulated back through your PCV system and intake, taking with it large amounts of oil vapors. This JLT Oil Separator kit installs in your PCV line to filter out oil before it can get into your engine's intake - where it doesn't belong - and cause damage. Black Mustang JLT Oil Separator (11-13 GT) JLTOSP-FMG11-B - Free Shipping!