Narrative:

While inbound to the VOR; about 240 NM to the east; the #1 engine oil pressure indicator on the lower display unit started flashing amber. The oil pressure reading was moving in and out of the amber range. Oil quantity indicated zero. All other engine indications were in the normal range. After we analyzed the situation; I called for the first officer to run the 'engine low oil pressure' checklist in the QRH. After completing the checklist; I gave aircraft control to the first officer and instructed him to handle ATC communications. After discussing the situation with the dispatcher and maintenance; we elected to divert to ZZZ with their concurrence. At about 70-80 mi from ZZZ at about FL280 the oil pressure in the #1 engine dropped into the red range. At this point the 'engine low oil pressure' checklist referred us to the 'engine failure/shutdown' checklist; which I called for and ran; shutting down the #1 engine. We declared an emergency with ATC and continued to ZZZ. We flew a single engine visual approach to the longest runway. The WX was very high broken clouds; good visibility; with the winds out of the south. The localizer was OTS; so as a back-up for the visual approach we briefed and set up to use LNAV and VNAV information. We also briefed overweight landing considerations. An uneventful landing was made.

Related reports:

Google
 

Original NASA ASRS Text

Title: LOSS OF OIL PRESSURE IN L ENG RESULTS IN AN ENG SHUTDOWN AND SUBSEQUENT DIVERT AND LNDG AT THE NEAREST SUITABLE ARPT.

Narrative: WHILE INBOUND TO THE VOR; ABOUT 240 NM TO THE E; THE #1 ENG OIL PRESSURE INDICATOR ON THE LOWER DISPLAY UNIT STARTED FLASHING AMBER. THE OIL PRESSURE READING WAS MOVING IN AND OUT OF THE AMBER RANGE. OIL QUANTITY INDICATED ZERO. ALL OTHER ENG INDICATIONS WERE IN THE NORMAL RANGE. AFTER WE ANALYZED THE SITUATION; I CALLED FOR THE FO TO RUN THE 'ENG LOW OIL PRESSURE' CHKLIST IN THE QRH. AFTER COMPLETING THE CHKLIST; I GAVE ACFT CTL TO THE FO AND INSTRUCTED HIM TO HANDLE ATC COMS. AFTER DISCUSSING THE SITUATION WITH THE DISPATCHER AND MAINT; WE ELECTED TO DIVERT TO ZZZ WITH THEIR CONCURRENCE. AT ABOUT 70-80 MI FROM ZZZ AT ABOUT FL280 THE OIL PRESSURE IN THE #1 ENG DROPPED INTO THE RED RANGE. AT THIS POINT THE 'ENG LOW OIL PRESSURE' CHKLIST REFERRED US TO THE 'ENG FAILURE/SHUTDOWN' CHKLIST; WHICH I CALLED FOR AND RAN; SHUTTING DOWN THE #1 ENG. WE DECLARED AN EMER WITH ATC AND CONTINUED TO ZZZ. WE FLEW A SINGLE ENG VISUAL APCH TO THE LONGEST RWY. THE WX WAS VERY HIGH BROKEN CLOUDS; GOOD VISIBILITY; WITH THE WINDS OUT OF THE S. THE LOC WAS OTS; SO AS A BACK-UP FOR THE VISUAL APCH WE BRIEFED AND SET UP TO USE LNAV AND VNAV INFO. WE ALSO BRIEFED OVERWT LNDG CONSIDERATIONS. AN UNEVENTFUL LNDG WAS MADE.

Data retrieved from NASA's ASRS site as of January 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.