MIL - American military specifications
Engine oils
The original API classification became insufficient at the long run and the American army therefore made its own specifications. This system (MIL) specifies the quality of the oil partly in generaly terms and partly in engine tests with demands on the chemical characteristics of the oil.
MIL-L-2104A, MIL-L-45199B, CATERPILLAR SERIES 3
These are older quality designations which are no longer valid, and no detailed descriptions of the qualities are given here.
MIL-L-2104B
During the 1960's this spefication replaced MIL-L-2104A. The difference is primarily that the new specification makes greater demands on the cleansing properties of the oils.
MIL-L-46152
This specification replaced MIL-L-2104B in 1972. It has been developed for diverse types of vehicles but does not apply to turbo engines. MIL-L46152 combines the demand on high class diesel engine oil with the maximum demand on oil for petrol engines.
MIL-L-461528
This specification replaced MIL-L-46152 in 1980, and covers the demands of API class SF.
MIL-L-2104C
This specification replaced MIL-L45199B in 1972 and has among other things higher demands for rust protection.
MIL-L-2104D
This specification replaced MIL-L-2104C in 1983 and convers the demands of API class CD.
