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Sources
- American Petroleum Institute. (June 16, 2011) http://www.api.org/
- American Petroleum Institute. "Engine Oil Licensing and Certification." April 2007. (June 7, 2011) http://www.api.org/certifications/engineoil/pubs/upload/150916thAdd10308forprint-2.pdf
- Society of Automotive Engineers International. (June 16, 2011) www.sae.org
- Mobil.com. "Car Engine Oils." (June 16, 2011) http://www.mobil.com/USA-English-LCW/carengineoils.aspx
- Valvoline. (June 16, 2011) http://www.valvoline.com
- Bruzek, Joe. "Choosing the Right Engine Oil." Cars.com. (June 7, 2011) http://www.cars.com/go/advice/Story.jsp?section=maintenance&subject=oil&story=choosing-oil&referer=advice&year=&aff=sacbee
- Demere, Mac. "Choosing (and Using) the Right Engine Oil." Edmunds.com. May 2009. (June 6, 2011) http://www.edmunds.com/car-care/choosing-and-using-the-right-engine-oil.html
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