From the Super Mario Wiki
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An Oil Barrel is a type of Barrel found in DK: Jungle Climber, used to fuel Funky Kong's Barrel Plane. The Kongs need to find all of them on a regular island and take them to Funky Kong in order to use them. When enough are collected, Funky Kong can fuel his Barrel Plane and take the Kongs to a smaller version of the island they are on to play a minigame.
The Oil Barrels seem to resemble Oil Drums, but with an image of a flame on the front.