Portable Oil Extractor
These features only exist in outdated versions of Galacticraft.
This item was removed in the version 184.108.40.2060 for compatibility. Now vanilla buckets are used to collect oil.
To use a Portable Oil Extractor, hold right click while looking in the direction of the oil while being within arm's reach. If you have a partially filled or empty Oil Canister in your inventory, the Portable Oil Extractor will fill it with oil.