CESSNA 152 IN CRUISE AT 3500 FT DECLARED AN EMER AND MADE AN OFF FIELD LNDG DUE TO ROUGH ENG AND LOW OIL PRESSURE. AFTER MAINT INSPECTION THE AIRPLANE WAS FERRIED TO THE HOME BASE FOR REPAIRS.

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MY STUDENT NOTICED THE ENG BEGINNING TO RUN ROUGH AND I SAW THE OIL PRESSURE GAUGE ON THE REDLINE ON THE LOW SIDE OF THE GREEN. WE NOTIFIED ATC OF OUR MECHANICAL SIT. THERE WAS A DRAG STRIP BELOW US THAT WAS NOT IN USE AT THE TIME. WE DECIDED THE BEST COURSE OF ACTION WOULD BE TO SET IT DOWN ON THE DRAG STRIP RATHER THAN RISK A COMPLETE LOSS OF ENG PWR FROM CONTINUING TO OUR HOME ARPT; ZZZ1. THERE WERE NO INJURIES OR PROPERTY DAMAGE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE COMBINATION OF THE ROUGH RUNNING ENG AND LOW OIL PRESSURE WAS THE REASON FOR THE EMER OFF FIELD LNDG. THE RPTR SAID WHEN THE FIXED BASE OPERATOR TECHNICIAN ARRIVED AND CHKED THE ENG IT'S CONDITION WAS THE SAME AS INFLT; ROUGH RUNNING AND LOW OIL PRESSURE. THE RPTR STATED THE TECHNICIAN RAN THE ENG AND ADVISED A MAINT FERRY TO THE FIXED BASE OPERATORS REPAIR FACILITY. THE RPTR SAID OPERATING THE ENG WITH NOTHING DONE TO CORRECT ITS CONDITION WAS NOT EASY TO ACCEPT. THE RPTR STATED THE TECHNICIAN ASSURED MYSELF AND THE STUDENT THE ENG WAS OPERABLE AND WOULD MAKE THE MAINT FERRY WITH NO PROB. THE RPTR SAID AGAINST HIS BETTER JUDGEMENT THE MAINT FERRY WAS FLOWN AND ACCOMPLISHED. THE RPTR STATED THAT HE IS NO LONGER EMPLOYED BY THIS OPERATOR.