The wonderful Oil Mania slot online comes with 25 pay lines, 3 rows, and 5 reels. Gameplay The game contains one additional bonus feature which will surely entertain you and help you to obtain really big prizes. The oil well under the reel with the Oil Tycoon begins to throw up oil, creating the Wild symbols on the rows one by one with each free spin. If the Oil Tycoon shows up during the feature, the number of the free games will be reset to three with the new Upwild growing from the oil well. If you are keen on slots with bonus spins you may like Oil Mania slot too, playing it at Slotopus for free!