If i purchase a seperate oil breather filter for my car does the hole where the original breather tube went into in the air filter need covering?
I'm not sure what you are referring to, but if you change or replace anything you won't want to leave a hole open that goes to the intake maniflod or valve cover.
PCV valves are in line check valves to vent the crank case.
Oil bath breathers were used in the 60 & 70's on vehicles that were operated in high dust areas. The intake air was actually drawn thru oil.
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