API CB Class
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Engine oils for diesel engines operating under medium load (obsolete class).
The class was approved in 1949 as an evolutionary development of the CA class, for use with fuel of raised sulphur content and no special quality requirements. API CB oils were also intended for use in turbocharged engines operating in light and moderate regimes. This class was often called "Supplement 1 engine oils," reflecting its compliance with the military specification MIL-L-2104A Supplement 1.