Flight Crew Private; Flight Crew Instrument
Flight Crew Last 90 Days 20; Flight Crew Total 850; Flight Crew Type 40
Human-Machine Interface
Aircraft Equipment Problem Critical
Air Traffic Control Provided Assistance; Air Traffic Control Issued New Clearance; Flight Crew Landed in Emergency Condition
Aircraft
After takeoff I immediately began to notice oil on my windshield.  by the time I was at 500 FT my windscreen was covered in oil.  I began an immediate left turn to join the left downwind for Runway 6.  I informed the Tower that I was returning to the airport for immediate landing with oil on my windshield.  This was acknowledged by the Tower and I was cleared to land on Runway 6.  By this time I was on downwind and starting to think I might want to land on Runway 15.  I asked the Controller if I could have Runway 15.  He cleared a Grumman [to exit] at the next taxiway and cleared me to land on Runway 15.  By this time I decided to continue to Runway 6.  Tower told me the airport was mine.  I made an uneventful and mostly blind landing on Runway 6.  The oil filler cap was loose and had come off inflight.
A Bellanca Viking pilot made an immediate return and landing with Tower's assistance when engine oil began coating his windshield after takeoff.  The oil filler cap had not been secured prior to takeoff.