Motor oil provides engines lubrication.[1]

Lubrication is a process in which a lubricant, such as an oil, is placed between two objects that work close together, so as to reduce wear caused by friction. This is common for engines, which are lubricated by motor oil.

An oil driller once explained to Aquaman that lubrication is essential to engines and they cannot operate without it, and oil is what gives engines lubrication[2]

References

  1. As seen in the Season 1 episode The Ultra Beam (1973).
  2. As seen in The Ultra Beam.

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