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Case you wish to achieve constant oil without needing to search for more prey, I have a suggestion.

Basilosaurus can be harvested for up to 203 oil upon slaughtering them, however, what most people do not know is that when tamed, they will constantly produce oil that slowly decays up to a stack of twenty, after which they will not produce any more until either there is less than twenty PRODUCED oil, as they can hold as much hard oil as they like, or until it is taken out of their inventory. They also produce it REMARKABLY quickly. Less than a day, and you can have up to sixty oil, and…. About sixty gasoline in turn. If you have trouble locating these Blubberbusses, which is the name of my original Basilosaurus, then look for the Crescent-Shaped South Haven Island, a perfect base location, for reasons I explained in my Silica Pearls Guide. Many Basilosaurus will spawn in the waters and within the water around and in the island. They are a passive tame, but avoid their Manta, which will become aggressive once you have fed the beast.

I hope that this has helped. From.: OMEGA, Hunter Of Shadows.