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A petroleum oil, a synthetically prepared product, or a combination thereof, prepared primarily for lubrication in crank cases of internal combustion engines. It usually contains additives for corrosion prevention and oxidation prevention, and may contain detergents. See also LUBRICATING OIL, GENERAL PURPOSE. It does not include LUBRICATING OIL, AIRCRAFT PISTON ENGINE.
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API ENGINE SERVICE CLASSIFICATION CI-4PLUS