MLG ACFT HAD INOP OIL PRESSURE GAUGE AND MAINT MADE ERROR IN DEFERRING THE OIL QUANTITY GAUGE WHEREAS THE OIL PRESSURE IS NOT DEFERRABLE. ACFT FLEW 3 FLTS WITH IMPROPER DEFERMENT.

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WRONG ENTRY OF DEFERRED ITEM ON THE MAINT RELEASE. ON TAXI OUT OF LAX; THE OIL PRESSURE GAUGE BECAME INOP. WE CONTACTED COMPANY MAINT; MENTIONED THE INOP GAUGE AND THAT ALL OTHER ENG INDICATIONS WERE NORMAL. THEY SAID TO RETURN TO GATE. AT THE GATE; WE CALLED STATION MAINT AND SAID WE HAD A PROB AND NEEDED A MECH. AFTER SEEING THE MECH WITH AN OIL CAN IN HIS HANDS; I OPENED THE COCKPIT WINDOW AND MENTIONED TWICE TO HIM THAT THE OIL PRESSURE GAUGE WAS INOP. THE MECH GAVE ME 2 THUMBS UP SUGGESTING HE UNDERSTOOD. AFTER A FEW MINS THE MECH CAME UP TO THE COCKPIT AND PUT A DEFERRED STICKER ON THE #2 OIL PRESSURE GAUGE AND A MAINT RELEASE WAS SENT OVER ACARS. WE WERE READY TO GO. ON THE 3 SUBSEQUENT FLTS; A MECH WOULD MEET THE PLANE AND CHK THE #2 ENG AND SEND A NEW MAINT RELEASE OVER ACARS. WHILE ON THE GND AT THE LAST LEG OF THE DAY; WE CALLED STATION OPS AND ASKED IF A MECH WAS GOING TO CHK THE #2 ENG. THEY SAID THERE WAS NO MECH AND THAT THEY WERE NOT AWARE OF ANY PROB. WE CONTACTED MAINT OPS AND DISCOVERED THAT THEY WERE CHKING AND DEFERRING THE #2 OIL QUANTITY GAUGE INSTEAD OF THE #2 OIL PRESSURE GAUGE WHICH CANNOT BE DEFERRED. IN CONCLUSION; THE CHANNELS USED BTWN MAINT AND CREW MEMBERS LED TO A BREAKDOWN IN COM. OUR MAINT OPS ARE SO EFFICIENT THAT I BECAME COMPLACENT AND DID NOT QUESTION THEIR ACTIONS. NEVER WAS THE ACFT AND PAX PUT AT RISK AND SAFETY WAS NEVER AN ISSUE. THE OVERALL SOLUTION IS FOR CREW MEMBERS TO TAKE THEIR TIME (NOT BE RUSHED) AND CLOSELY CHK THE PAPERWORK TO INSURE THAT THE PROPER ITEMS WERE WORKED ON.