A CANADAIR CL-65 IN CRUISE AT FL 330 DECLARED AN EMER AND MADE AN EMER DSCNT DUE TO 'ACRID' ODOR FOLLOWED BY GRAY SMOKE IN COCKPIT AND CABIN. CAUSED BY FAILED LEFT ENGINE OIL SEAL.

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ON FLT; IN CRUISE AT FL330; ENROUTE FROM ZZA TO ZZB BOTH PILOTS SMELLED AN ACRID; 'BURNING' ODOR FOLLOWED BY GRAY SMOKE AND A 'DISPLAY COOL' CAUTION MSG. WE DONNED OUR MASKS AND DECLARED AN EMER WITH ATC. I (CAPT) TOLD THE FO TO CONTINUE FLYING THE ACFT AND MONITOR THE RADIOS WHILE I PERFORMED THE EMER CHKLISTS AND NOTIFIED COMPANY. WE INITIATED AN EMER DSCNT TO LAND AT NEAREST SUITABLE ARPT. WE DEPLOYED THE PAX'S MASKS AND NOTIFIED THE FA WHO TOLD US THERE WAS SMOKE IN THE CAB ALSO. DURING THE DSCNT; THE SMOKE CLRED. WE LANDED; CLRED THE RWY; SHUT DOWN; AND IMMEDIATELY DEPLANED THE PAX WITH THE AID OF THE LOCAL CRASH/FIRE/RESCUE TEAM; WE INSPECTED THE ACFT FOR DAMAGE AND AWAITED MAINT. I NOTIFIED OUR COMPANY AND HAD THE FO ATTEND TO THE PAX. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE FIRST FLIGHT OF THE DAY THE AIRPLANE HAD A 'DISPLAY COOL' CAUTION WARNING ACCOMPANIED WITH AN 'ACRID' ODOR. THE RPTR SAID THE DISPLAY COOLING FAN WAS REPLACED AND THE AIRPLANE RETURNED TO SVC. THE RPTR STATED ON THE NEXT FLT IN CRUISE AT FL330 THEY AGAIN SMELLED AN 'ACRID' ODOR FOLLOWED BY GRAY SMOKE. THE RPTR SAID AN EMER WAS DECLARED AND AN EMER DSCNT INITIATED. THE RPTR SAID THE PAX OXYGEN MASKS WERE DEPLOYED DUE TO SMOKE IN THE CAB. THE RPTR STATED DURING THE EVACUATION NO ONE WAS INJURED OR REQUIRED MEDICAL ASSISTANCE. THE RPTR SAID MAINT ADVISED THE CREW A LEFT ENGINE OIL SEAL WAS LEAKING OIL INTO THE BLEED AIR AT HIGH POWER SETTINGS. THE RPTR SAID THE ENGINE WAS A GENERAL ELECTRIC CF34-3A1.