Oil separator for recycled blow-by gas

An oil separator for recycled blow-by gas, comprising:

• a casing having an inlet pipe for blow-by gas entrance, an outlet pipe for blow-by gas discharge, and an oil return pipe for separated oil discharge, said inlet and outlet pipes being located at first and second ends of said casing, respectively;
• first and second perforated plates disposed within said casing, said first perforated plate being located nearer to said casing first end than said second perforated plate, said first and second perforated plates having first and second perforated sections, respectively, which are located opposite to each other with respect to a longitudinal axis of said casing;
• first and second plate type filter members formed of a porous material and disposed within said casing, said first filter member being located between said first and second perforated plates, said second filter member being located nearer to said casing second end than said second perforated plate;
• and
• means defining a first space between said first perforated plate and said first filter member, and a second space between said second perforated plate and said second filter member, said second space being larger than said first space.