File:DKJC OilBarrel.jpg
Donkey Kong near an Oil Barrel.
An Oil Barrel is a type of Barrel found in DK: Jungle Climber, where the Kongs must collect them all on a island (excluding the little version of each island) and bring them to Funky Kong. He'll use them in to fuel his Barrel Airplane that can take the Kongs to a little version of the island they're on.
The Oil Barrels seem to resemble Oil Drums only they are blue in color.