Level 10 Oasis Picture

do lv 10 oasis ever lose lvs?

if you occupy a lvl 10 oases for more than 24 hours then it drops a level, like usual, if you resign a level 10 oases it becomes a lvl 0 oases

the only way to keep an oases at level 10 is to make sure someone takes it from you then take it back

thanks