AN A320 HAD BOTH ENGS SVCED WITH THE INCORRECT OIL. BOTH ENGS WERE SVCED WITH 4 QUARTS EACH. LIMIT 2 QUARTS WHEN OIL INTERMIXED.

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ACR Y MECH CALLED OUT TO SVC ENG OILS ON AN ACR X ACFT. ACR X OIL WAS LOCKED UP AND ACR X PERSONNEL COULD NOT FIND KEY SO ASKED ME TO USE ACR Y OIL TYPE 2197 IN PLACE OF THEIR 2380. I CALLED ACR X MAINT CTL WHO SAID IT WAS FINE TO MIX THESE OILS; THEY DO IT ALL THE TIME AND HE WOULD SEND PROPER PAPERWORK A LITTLE LATER AFTER HE FINISHED WHAT HE WAS DOING. ACFT SVCED WITH 4 QUARTS EACH ENG AND LOGBOOK PAPERWORK COMPLETED. WHEN MAINT MANUAL FAXED TO US BY ACR X MAINT CTL IT SAID OIL MIXING WAS LIMITED TO 2 QUARTS EACH ENG. WE CALLED ACR X MAINT CTL AND EXPLAINED SIT AND WAS TOLD THAT IT WAS FINE; HE WOULD PUT A DEFERRED ITEM AGAINST THE AIRPLANE TO HAVE OIL TANKS DRAINED AND RE-SVCED AT END OF NEXT FLT. SO LOGBOOK WAS COMPLETED AND BROUGHT UP TO FLT DECK AND ACFT DISPATCHED. ON TAXI TO RWY; ACR X MAINT CTL CALLED ACFT BACK TO GATE SAYING THEY NOW DETERMINED THE OIL MIXING WAS NOT ACCEPTABLE AND OIL SYS HAD TO BE FLUSHED AND FILTERS CHANGED BEFORE FURTHER FLT. THE PAX AND BAGGAGE WAS XFERRED TO A DIFFERENT ACFT FOR THE FLT AND ACR X MAINT PERSONNEL BROUGHT UP THE NEXT MORNING WITH THE FILTERS AND SUPPLIES NEEDED.