M-20 Ultra Air/Oil Separators are the most technologically advanced separators in aviation.  Their performance is proven every flight.  They Control Blow-by so the oil stays full.  No others come close.

           1.  Oil stays FULL flight after flight, because only an M-20 can CONTROL Blow-by
           2.  With Blow-by controlled, oil “burn” is typically only ½  to 1 quart between oil
                changes, based on engine size and condition.
           3.  Proven on your dipstick every flight.  No others come close.

Already have a separator that forces you to start 2 quarts low and hides the oil it cannot separate in a filter?  Look in that filter.  It  emulsifies dirty oil into sludge which contaminates your engine.  Save maintenance cost and your engine life.   Scrap it and upgrade to an M-20

Flying constantly with FULL oil has impressive cost advantages, although most pilots buy them just to keep their belly clean.  Cost advantages are:

           1. Engines last up to 75% longer. 
                 a. That is, TBO’s from 2,800 hours to 3,500 hours, depending on make.
                     That would be engine life cost savings of about $10,000 to $25,000.
                     Do the arithmetic yourself.

           2. FULL oil provides greater cooling of CHT, EGT (and TIT on turbo’d engines).
                 a. That is generally enough to lean 2 GPH to 4 GPH less fuel flow than book
                     settings and stay safely rich of peak.
                 b. Savings amount to $14,000 to $28,000 at today’s fuel prices.  Add this
                     to the engine life savings, above.  Do the arithmetic yourself.