also: ゆそん
noun
oil barrel; oil cask
A barrel or cask used for storing or transporting oil.
倉庫には古い油樽がいくつも積まれていた。
Several old oil barrels were stacked in the warehouse.
ドラム缶 is a modern steel drum, while 油樽 is a traditional wooden barrel or cask specifically for oil.
Compound of 油 (あぶら, 'oil') and 樽 (たる, 'barrel'). The reading ゆそん is likely a rare or dialectal variant.