- "Thank the maker! This oil bath is going to feel so good. I've got such a bad case of dust contamination, I can barely move!"
Oil baths, also known as lubrication baths, were a means of removing such things as dust, dirt, and various other forms of matter that collected in a droid's joints and sockets, similar to a regular water bath for Humans. Without treatment, the debris could cause the joints to become difficult to move or lock up altogether, a condition known as dust contamination.
- "Did you hear something go 'clank' a moment ago?"
"It was probably just my rusty knee joints."
"You too? I thought I was the only one who suffered from metal fatigue."
"Maybe it's because we're exposed to the elements."
- ―Two B1 battle droids
The Great Heep was known to provide such a cleansing, along with other pleasantries, to unassuming droids before consuming them.
Luke Skywalker treated C-3PO to an oil bath on the Lars moisture farm after his uncle Owen Lars purchased the droid from Nebit's Jawa tribe, which delighted him. Due to his memory wipe in 19 BBY, however, C-3PO was unaware that he had been similarly given an oil bath by a restless Padmé Amidala in the Lars garage when she needed a task to take her mind off Anakin's rescue of his mother. The bathing session had been much-needed, as the protocol droid had extensive amounts of sand and dirt lodged in his coverings.
- Star Wars: The Old Republic (Mentioned only)
- Darth Plagueis (Mentioned only)
- The Adjudicator Special Report: Tools of the Trade (Mentioned only)
- Star Wars Episode II: Attack of the Clones novelization
- Star Wars: The Clone Wars – "Evil Plans"
- Star Wars: The Clone Wars – "Missing in Action" (Mentioned only)
- "Memory Loss"—Star Wars Comic 13
- Star Wars: Droids—"The Pirates of Tarnoonga"
- Star Wars: Droids—"The Great Heep"
- Star Wars Episode IV: A New Hope novelization (First appearance)
- Star Wars: Episode IV A New Hope
- R2-D2's Mission: A Little Hero's Journey
- Star Wars 12: Doomworld! (Mentioned only)
- Star Wars 13: Day of the Dragon Lords
- Traitor's Gambit
- Star Wars Galaxies
- Planet of the Mists
- Debts to Pay
- Star Wars Missions 13: Prisoner of the Nikto Pirates
- Star Wars 47: Droid World (as lubrication bath)
- Star Wars 52: To Take The Tarkin (as lube bath)
- Star Wars 58: Sundown! (Mentioned only) (as lube bath)
- Fate of the Jedi: Conviction