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Assuming the cup is clean, and the correct oil, at the level marked on the side, is the situation. The only way oil can be drooling and be "blowing out" is from internal pressure. Internal pressure can come fron turning the engine backwards (happens when shutting off hot quite often), or Modest to sevier backfiring in the intake manifold, or pressure coming from the crancase vent from valve cover to air cleaner (not likley, may not have the tube, I can't remember).
If intake backfire, it can be muffeled and not loud. But it may indicate an intake valve that is beginning to go bad, or sticking, causing flame to ignite intake charge. Because there should not be oil mist and deposits on the precleaner, there may be further indication of internal issues with valves.
Check the road draft tube (open tube on right side by frame rail) to be sure it is not clogged. Two bolts, and it is off, clean in solvent and rod out to be certain.
If this tube is basically clean already, I would do a compression check, then a cylinder leakdown check. Good luck and let us know what happens.
JimN
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