What is a lubricating oil?

In general, it is a substance that reduces friction when placed between two surfaces with relative motion. There are lubricants with different grades and viscosities, although their functions have a lot of similarities as they:

  • Reduce friction between two metal surfaces.
  • Protect mechanical components from wear and corrosion.
  • Clean and cool engines.
  • Act as a sealant between the segments/pistons and jackets in order to prevent gas leaks from occurring inside the combustion chamber.