Olevm addere camino - To pour fuel on the stove adding gasoline to a fire
Olevm perdisti - You have lost oil you've wasted your time on this criticism for a misallocation of resources
Olim habeas eorum pecuniam, numquam eam reddis: prima regula quaesitus - Once you have their money, you never give it back: the 1st rule of acquisiton

Olim

Formerly

Omne ignotum pro magnifico est - We have great notions of everything unknown. (Tacitus)
Omne initium est difficile - Every beginning is difficult
Omne trium perfectum - Everything that comes in threes is perfect
Omne tvlit pvnctvm qvi miscvit vtile dvlci - [he] has gained every point who has combined [the] useful [with the] agreeable
Omnes aequo animo parent ubi digni imperant - All men cheerfully obey where worthy men rule. (Syrus)
Omnes deteriores svmvs licentia - Too much freedom debases us