How high above your crankcase is the end of your vent tube? Pressure inside the crankcase (as the pistons and rods spin whipping things up) can push the oil up a little inside the tube. If the end of the tube isn't at least 4" or 6" above the crankcase you could get a little oil pushed up and out of the end under normal crankcase pressures.
On a seperate but related note if your engine (rings) is letting excessive pressure past the piston rings (blowby) this additional pressure can also push the oil "spray" inside the crankcase even higher making the oil seep even higher in your vent tube. A bit of blowby is a fact of life on any piston engine but with worn rings blowby will increase further increasing crankcase pressure. The more pressure, the further up a bit of oil can creep up the vent tube.
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Last edited by Spencer1; 04-30-2013 at 07:52 AM.
Reason: corrected information