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Sources
  • AA1Car. "Motor Oil Viscosity." (June 10, 2011) http://www.aa1car.com/library/oil_viscosity.htm
  • AMSOIL. "Motor Oil Viscosity Grades." (June 10, 2011) http://www.upmpg.com/tech_articles/motoroil_viscosity/
  • STP.com. "FAQs: Oil Additives." (June 10, 2011) http://www.stp.com/faqs/oil-additives/
  • The Car Bibles. "Engine Oil Additives." (June 10, 2011) http://www.carbibles.com/additives.html
  • The Car Bibles. "The Engine Oil Bible." (June 10, 2011) http://www.carbibles.com/engineoil_bible.html