AN MD80 CAPT RPTS THE MEL CARRIED ON THE AIRPLANE DOES NOT HAVE THE REQUIRED SPECIAL PROCS THAT MUST BE ACCOMPLISHED.

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OPERATED ACFT X OUT OF ZZZ WITH A PLACARDED APU AND APPARENTLY INCOMPLETE LOGBOOK SIGN OFF. AFTER CONSULTING MEL; IT APPEARED PROPER MAINT PROCS HAD BEEN FOLLOWED CONCERNING MEL REQUIREMENTS; AND NOW I'M NOT SO SURE THE LOGBOOK HAD BEEN PROPERLY SIGNED OFF BY MAINT. AFTER ARR IN ZZZ1; IT WAS DETERMINED THAT THE INFO CONTAINED IN THE MEL PROCS OF THE FLT PLAN WOULD HAVE LED ME TO CONSULT WITH MAINT CTLR CONCERNING MAINT SIGN OFF PROCS. CLARIFICATION CONCERNING PROPER MEL SIGN OFF IN CONJUNCTION WITH THE USE OF THE LIST CONTAINED IN THE FLT PLAN SHOULD BE GIVEN TO OUR FLT CREWS. HOW ABOUT A FLT OPS BULLETIN DESCRIBING PROPER UTILIZATION OF THE MEL PROCS LIST/MEL? CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED IT WAS FIRST NOTED WITH AN APU DEFERRED AS INOP AND PLACARDED AS INOP. THE RPTR SAID THE MEL CARRIED ON THE AIRPLANE INDICATES THE APU CAN BE DEFERRED BUT SPECIAL PROCS THAT MUST BE ACCOMPLISHED ARE NOT LISTED. THE RPTR STATED IN THIS CASE THE SPECIAL PROCS ARE A VISUAL CHK OF THE L AND R ENG CSD OIL LEVEL PRIOR TO DEP. THE RPTR SAID IF THE MEL IS TO BE USED AS THE FINAL AUTH ON WHAT YOU CAN FLY WITH; THEN IT MUST CONTAIN ALL OF THE REQUIRED PROCS TO BE USED IF YOU HAVE INOP EQUIP. THE RPTR STATES THE PROB WITH THE MEL IS CAUSED BY THE CARRIER OPERATING SO MANY MODELS OF THE MD80 THAT THEY CAN'T KEEP UP WITH THE PUB.