A J41 EXHIBITS LOW OIL PRESSURE READING OF NEAR ZERO; FOLLOWED BY THE R ENG OIL PRESSURE LIGHT BEING ILLUMINATED. THE CREW COMPLIES WITH THE CHKLIST ITEMS AND SHUTS THE ENG DOWN. THE PIC ELECTS TO DIVERT TO PATUXENT NAS. THE ACFT'S R ENG HAD LOST ITS OIL THROUGH SOME SORT OF OIL SYS FAILURE.

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ON APR/XA/98; WE WERE FLYING FROM JFK TO RIC IN A JETSTREAM 41 OPERATED BY XYZ. DURING CRUISE WE NOTICED THAT THE OIL PRESSURE FOR THE R ENG WAS READING NEAR 0 PSI. WE IMMEDIATELY PULLED OUT THE EMER AND ABNORMAL CHKLIST BOOKLET TO OBTAIN THE REQUIRED CORRECTIVE ACTION. AS WE STARTED TO REVIEW THE CHKLIST FOR LOW OIL PRESSURE READINGS THE RED CAP (CAPTION) FOR THE R ENG OIL PRESSURE ILLUMINATED. AS PER COMPANY PROCS THIS REQUIRES MEMORY ITEMS TO BE PERFORMED WHICH LEADS TO SECURING THE ENG. WE COMPLETED THE MEMORY ITEMS AND THEN CONTINUED WITH THE EMER CHKLIST FOR ENG SHUTDOWN INFLT. THE ENG WAS SECURED WITHOUT FURTHER INCIDENT. PAX RIVER NAS AND ST MARY'S WERE THE 2 CLOSEST SUITABLE ARPTS TO OUR POS AT THE TIME OF THE EMER. WE CHOSE TO LAND AT PAX RIVER BECAUSE THEY HAD AN 11000 FT RWY; AN OPERATING CTL TWR WITH APCH CTL RADAR; AND TRAINED RESCUE PERSONNEL. ST MARY'S ONLY HAD A 5000 FT RWY AVAILABLE WITH NO OPERATING CTL TWR AND NO RESCUE PERSONNEL AVAILABLE. AFTER LNDG WE INSPECTED THE OUTSIDE OF THE R ENG COWLING AND FOUND OIL DRIPPING FROM THE BOTTOM OF THE ENG AND COATED ALL OVER THE R MAIN GEAR. THIS OBVIOUSLY SHOWS SOME TYPE OF OIL SYS FAILURE. I FEEL THAT THE CREW DID A VERY PROFESSIONAL JOB HANDLING THE EMER. THERE WERE NO INJURIES; NO SIGNS OF FIRE OR SMOKE DURING THE INCIDENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE PIC STATED THAT THIS TYPE ACFT IS PWRED BY A 2 GARRETT TYPE 331-14HR (COUNTER ROTATING PROPS) TURBINE ENGS. THIS TYPE ENG HAS HAD A PROB WITH FAULTY ENG TRANSDUCERS (ENG OIL PRESSURE SENSING DEVICE). THERE HAVE BEEN 4 CASES IN THE LAST YR THAT THE RPTR KNOWS OF WHERE A FAULTY TRANSDUCER WAS ASSOCIATED WITH LOSS OF ENG OIL. ONE CASE WAS SO DIFFICULT TO RESOLVE THAT THE ENG WAS FINALLY CHANGED TO MAKE THE ACFT SVCABLE. RPTR DOES NOT KNOW WHAT THE COMPANY IS DOING ABOUT THIS SIT. THE PIC DECLARED AN EMER TO ENSURE THE AVAILABILITY OF THE EMER GND EQUIP.