fd56ec0a_MOTOR_OIL_GUIDE__Use___Definition
[API Symbol] CC (obsolete) (Moderate Duty Diesel and Gasoline Engine Service) [Use & Definition] 
Service typical of lightly supercharged these I engines operated in moderate to severe duty and has included certain heavy duty gasoline engines. Oils designed for this service were introduced in 1961 and used in many trucks and In industrial and construction equipment and farm tractors. These oils provide protection from high temperature deposits in lightly supercharged diesels and also from rust, corrosion, and low temperature deposits in gasoline engines.
MOTOR OIL GUIDE
Use & Definition