The DieselFuel Depot is a destination. Lowering the spout on the left tank drains the "oil," and pushing the lever on the right tank loads the oil barrel into the waiting barrel car below. It comes with Diesel, a Vicarstown Dieselworks Barrel Car Barrel Car with two Fuel Barrels, and an 8" Straight Track piece.
The Diesel Fuel Depot seems to be a combination of two older destinations. The left tank is based on the Water Tower (only with oil instead of water), and the right tank is based on the Barrel Loader.