Nearly all lubricants contain engine oil additives whether the oils are synthetic or petroleum based.

Engine oil-additives are chemical compounds that improve the lubricant performance of base oil.

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Actually, nearly all lubricants contain additives (from 10 to 30%), whether the oils are synthetic or petroleum based. Also, Engine oil additives are chemical compounds that improve the lubricant performance of base oil (or oil “base stock”).

Motor oil additives have three basic roles:

  1. Enhance existing base oil properties with antioxidants, corrosion inhibitors, anti-foam agents and demulsifying agents.
  2. Suppress undesirable base oil properties with pour-point depressants and viscosity index (VI) improvers.
  3. Impart new properties to base oils with extreme pressure (EP) additives, detergents, metal deactivators and tackiness agents

Engine oil (also sometimes called motor oil) has two primary purposes:

  • To lubricate the moving parts of your engine which minimizes friction.
  • To protect metallic surfaces from the process known as corrosion.

It’s rare, however, that engine oil can do these things without the addition of extra chemicals. The most important of these engine oil additives are viscosity index improvers (VIIs).

So, The viscosity of oil is more or less equivalent to its thickness. Even more, Its willingness to flow freely through the engine and coat all the parts that need coating.


  • Oil with too high a viscosity will be reluctant to flow and will gum up the works.
  • Oil with too low a viscosity will flow through the engine like water, not sticking around long enough to do its job.

Furthermore, the viscosity of oil changes with temperature, becoming more viscous when cold and less viscous when hot. As a result, Viscosity is affected by both the weather and how warm your engine is.




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