How oases work

Well an Oasis has a 10 day life cycle from level 0 back to level 0, I think logically that someone has to interupt that cycle by oocupying it at any point for the next 0 to be a 10 possibility, that would account for not seeing many random lvl 10 oasis's, but only those that are intentionally made.

Thoughts .. ?

i think its a 9 day cycle, that becomes 10 days once the oasis has been interrupted, and turned into a lvl 10 oasis.

I agree with yodac.

Also, you can't "make" a lv10 oasis. You can occupy and lower an oases level to 7 to increase the opportunities for one to appear on the map, but whether an oasis has ever been occupied or not, it may or may not turn into a lv10.

actually, it has to be owned, and then resigned, before it transforms.