SPECIFICATION DEF/2101, now published, supersedes C.S. 2463, and covers Oils OMD‐60, OMD‐110, and OMD‐330. These three grades are designed for use in the compression ignition and spark ignition engines of ground equipment operated by the three Services. It covers H.D. oils. The I.Pet. 124/49 test for engine testing is included with some modifications, one of which calls for 0.35 per cent. minimum sulphur content in the fuel instead of 0.40 per cent. maximum. The cetane number of the fuel is modified to 40 to 45, instead of 43 min. and 53 max. No additives must be used to produce a clean fuel. There are other minor modifications. Engine testing in accordance with MIL‐0–2104 (ORD) is also included with several modifications in line with those mentioned above. The price of this Specification is one shilling net.
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