Somebody know how to make the Oil Coat stay after taming? i think i tamed the whole area with no results, they all lose the aura to become the average worg

Help me please
Edit: i even opened a ticket with a GM and after payimg him a joke for the clue he told me "you must tame a slightly different one on the same area" but they look the same to me, lvl 70 or 71 is the only difference and they all lose the Oil Coat