CL65 CREW SHUT DOWN #1 ENG BECAUSE OF NO OIL PRESSURE IN CZYZ CLASS A AIRSPACE.

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WE WERE ENRTE FROM CVG TO YUL (MONTREAL) AND HAD JUST LEVELED OFF AT FL330. WE GOT A L ENG OIL PRESSURE WARNING MESSAGE AND NOTICED THAT THE OIL PRESSURE WAS DROPPING OFF RAPIDLY. WE ASKED AND RECEIVED CLRNC TO FL240. DURING INITIAL DSCNT; WE SHUT DOWN #1 ENG AS PER CHKLIST AND ASKED FOR CLRNC TO TORONTO. WE DECLARED AN EMER; COMMUNICATED WITH FLT ATTENDANT; AND PAX; AND COMPLETED OUR CHKLISTS. WE LANDED WITHOUT INCIDENT ON RWY 5 IN TORONTO AND TAXIED TO THE GATE. AFTER ENG SHUTDOWN AND WALKAROUND; WE NOTICED AN OIL SMELL AND WHAT APPEARED TO BE BURNING OIL (SMALL AMOUNT) FROM #1 ENG. PRIOR TO LEAVING THE GATE IN CVG; I HAD ASKED THE FO TO CHK THE OIL AS IS REQUIRED ON FINAL OUTBOUND FLT OF THE DAY PER OUR FLT STANDARDS MANUAL. WHEN FILLING OUT THE LOGBOOK AFTER LNDG; FO INFORMED ME THAT HE HAD FORGOTTEN TO CHK THE OIL. IN THIS SIT; WE NORMALLY REPLENISH; CHK OIL BEFORE LEAVING THE ACFT FOR THE NIGHT. I DON'T BELIEVE THAT THIS WAS RELATED TO THE ENG SHUTDOWN AS OUR OIL PRESSURE HAD DROPPED TO 0 PSI; BUT MENTION IT BECAUSE IT MAY HAVE ALERTED US TO AN OIL LEAK IF PRESENT.