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Why is quality motor oil important?

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  • American Petroleum Institute. "API Motor Oil Guide." (May 26, 2010)
  • American Petroleum Institute. "Impact of Low Quality Oils on Engine Wear and Sludge Deposits." (May 26, 2010) vs SL comparison.pdf
  • "The Engine Oil Bible." (May 26, 2010)
  • Weissler, Paul. "How To Pick The Right Motor Oil For Your Car." (May 26, 2010)