PLT OF AN SMA SEL ACFT PENETRATED AN ARSA AND ATA AIRSPACE PRIOR TO ESTABLISHING COMS DUE TO 'HDG' FOR THE NEAREST ARPT AFTER LOSING ENG OIL PRESSURE.

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THE PROB AROSE WHEN A NOTE OF AN OIL PRESSURE DROP FROM THE MIDDLE OF THE GREEN TO THE BOTTOM AND THEN A SLIGHT DROP AGAIN TO THE TOP OF THE YELLOW. THIS WAS UNUSUAL FOR THIS ACFT. AFTER THE INDICATION OF OIL PRESSURE LOSS; AN IMMEDIATE DECISION WAS MADE TO SECURE THE ACFT TO THE NEAREST SUITABLE ARPT. FROM THE POS NOTED ON THE CHART BY PILOTAGE A TURN WAS MADE TOWARDS EITHER COLUMBIA METRO OR COLUMBIA OWENS DOWNTOWN. DUE TO THE DOWNTOWN AREA BEING BTWN THE ACFT AND THE ARPT A DECISION WAS MADE TO GO DIRECT TO CAE METRO SO IF IN THE EVENT AN ENG FAILURE DID OCCUR; A MORE SUITABLE SITE FOR EITHER AN EMER LNDG OR PRECAUTIONARY LNDG COULD BE MADE. THE DECISION WAS TO GO DIRECT TO CAE METRO WHICH WAS ALSO CLOSER. AFTER MAKING THIS DECISION A FIX ON THE ARPT WAS ATTEMPTED VISUALLY WHICH WAS DIFFICULT DUE TO HAZE. AFTER WHAT WAS THOUGHT TO BE THE ARPT A FIX OF THE POS WAS ATTEMPTED BY USING PILOTAGE AND A VOR RADIAL FROM THE CHESTERFIELD VOR. A 'FROM' INDICATION WAS NOTED WITH A 235 DEG RADIAL WAS SECURED. ALSO A RADIAL WAS THEN ESTABLISHED FROM THE CAE VOR WAS ESTABLISHED WHICH WAS 354 DEG FROM. A CROSS- RADIAL FIX WAS SECURED AND A POS WAS ESTABLISHED WHICH INDICATED A POS JUST INSIDE THE ARSA. AN ATTEMPT WAS THEN TO SECURE APCH CTL; BUT WAS DIFFICULT WHEN I REACHED FOR AN APCH PLATE THAT WAS LOCATED BEHIND THE PLT SEATS. THE FIRST ONE I LOCATED WAS NOT THE CORRECT ONE AND THE SECOND PLATE WAS THE ONE I NEEDED FOR THE REGION. DURING THIS TIME I WAS STILL MONITORING ENG PERFORMANCE AND STILL LOOKING FOR A POTENTIAL EMER LNDG SITE IF NEEDED. THIS WAS DONE WHILE GOING DIRECT TO CAE METRO. IT WAS THEN NOTED THAT IT WAS TOO LATE FOR APCH AND THE TWR WAS THEN CONTACTED FOR LNDG INSTRUCTIONS. AT THIS TIME THE OIL PRESSURE HAD STABILIZED JUST BELOW THE GREEN. GND SPD WAS ABOUT 110 MPH AND TAS WAS AROUND 116 MPH. A PRECAUTIONARY EMER LNDG WAS THEN MADE AT CAE METRO WITHOUT EVENT. TWR INDICATED THAT I WAS IN AN ARSA AND I ACKNOWLEDGED THAT I UNDERSTOOD HIS STATEMENT. TWR THEN TOLD ME TO STANDBY FOR A PHONE NUMBER. I TAXIED CLR OF THE ACTIVE AND SECURED THE ACFT. A PHONE NUMBER WAS NEVER ISSUED FROM THE TWR WHILE TAXIING OR AT RAMP. AFTER CONTACTING TWR IT WAS NOTED THAT I HAD PENETRATED THE ATA FROM HIS RADAR FIX ESTABLISHED BY XPONDER CODE ISSUED. CONTRIBUTING FACTORS OF THIS SIT WERE: 1) LOW OIL PRESSURE READING AND SUBSEQUENT DECISION TO DIVERT TO AN ARPT THAT WAS NEVER IN THE FLT PLAN. 2) HAZE. 3) NOT FAMILIAR WITH THE AREA; ARPT FREQS; LANDMARKS. 4) A RELUCTANCY TO USE THE ARSA WHEN IT WAS NOTED THAT ARSA AIRSPACE PENETRATION OCCURRED. IF I WOULD HAVE HAD ANOTHER ARPT CLOSER OTHER THAN THE 2 NOTED; I WOULD HAVE DIVERTED TO THAT OTHER ARPT(S). JUDGEMENT IN THE ABOVE SIT IN MY OPINION WAS PRUDENT AND DID DEMONSTRATE PROPER DECISION MAKING. THE ACTIONS TO SECURE ATC CONTACT WAS THE CORRECTIVE ACTIONS TAKEN WHEN IT WAS NOTED THAT ARSA PENETRATION HAD OCCURRED.