Apparently the 'head-choppers' have allegedly recently captured a number of Turkish Leopard 2A4 intact:
http://www.middleeasteye.net/news/claims-capture-two-tanks-after-killing-70-turkish-troops-syria-845385252
How long might such a thing reasonably remain operable in the hands of crews unfamiliar with the type.....How easy would it actually be for these loonies to use one in anger?