A B737-200 ON LEVELOFF AT FL230 DECLARED AN EMER AND DIVERTED DUE TO THE #2 ENG OIL FILTER BYPASS LIGHT ILLUMINATED CAUSED BY A FAILED PRESSURE SWITCH.

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AT LEVELOFF (FL230) #2 ENG OIL BYPASS ILLUMINATED. FOLLOWED QRH; WHICH REQUIRED ENG SHUTDOWN. DECLARED EMER AND DIVERTED TO ZZZ. CONDUCTED SE APCH AND LNDG. THIS IS THE SECOND TIME THIS ACFT (THIS ENG) WAS SHUT DOWN IN LAST 2 MONTHS. THIS COMPANY HAS HAD 5 INFLT ENG SHUTDOWNS IN LAST 2 MONTHS. (AIRLINE HAS XA AIRPLANES.) NOTE: BOTH CREW EXPERIENCED HIGH FREQ VIBRATION IN THRUST LEVER; FUEL SHUTOFF LEVER; AND AIRFRAME. MECHS FOUND METAL CONTAMINATES IN OIL FILTER. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE HVY MAINT ON THE ENGS IS PERFORMED BY AN OUTSIDE CONTRACT ENG REBUILDER AT THE LOWEST PRICE POSSIBLE. THE RPTR SAID THE ENGS WERE PURCHASED OUTSIDE THE COUNTRY AND WERE HIGH TIME ENGS AND THE ENG COMPONENTS WERE ALSO FARMED OUT TO A LOW BIDDER. THE RPTR SAID THE ACR HAS SUFFERED 5 UNCONTAINED TURBINE FAILURES SINCE SPRING OF 1997 WITH 5 ENG SHUTDOWNS FOR COMPONENT FAILURE IN THE LAST 60 DAYS. THE RPTR SAID THE MAINT BUDGET IS CUT AND THE BOTTOM LINE LOOKS GOOD BUT SOME ATTN MUST BE GIVEN TO SAFETY.