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The Landing School
Motor Oil Viscosity
Motor Oil Viscosity Grades
"What does the SAE Viscosity rating on your Motoroil bottle mean?" (from the site)
Motor Oil Guide by API
Link describes API’S CERTIFICATION MARK AND SERVICE SYMBOL which identifies quality motor oils for gasoline- and diesel-powered vehicles. Oils displaying these marks meet performance requirements set by U.S. and international vehicle and engine manufacturers and the lubricant industry. More than 500 companies worldwide participate in this voluntary program, which is backed by a marketplace sampling and testing program. (from the site)