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MIL-T-62531(AT)
APPENDIX A
3.4.5.4 Engine lubrication system. The lubrication system shall operate satisfactorily under
all intended service, operating and performance requirements specified herein when serviced
with seasonal grades of oils as specified in MIL-L-2104 from minus 23C to plus 52C and
MIL-L-46167 from minus 54C to 18C. The oil pressure shall not fall below minimum
recommended by the engine manufacturer even with the oil level at the lowest marked safe
operation level on the oil gage. At initial truck assembly, contractor may utilize an engine oil of
his own selection for ambients of minus 23C to plus 49C only, provided oil selected its
compatible with oil as specified in MIL-L-2104.
Rationale
All engine parts that have working surfaces are subject to wear or deterioration and must be
provided with adequate lubrication. The lubricant used shall be compatible with seals and other
construction materials used, and shall deliver satisfactory performance over a wide range of
climatic conditions. The lubricants specified will deliver the required performance for all
conditions within the temperature extremes specified.
Guidance
Examine the contractors records for proof or certification that the lubricants meet the
specification requirements.
Lessons Learned
4.4.5.4 Engine lubrication system test. To determine conformance to 3.4.5.4 the contractor
shall provide a laboratory analysis or certification verifying that the oil provided in the engine
meets the requirements of MIL-L-2104. The engine shall be operated at idling speed and the oil
pressure must not fall below the minimum safe operating pressure.
Verification Rationale
To ensure the serviceability of the engine, the lubricating oils shall be as specified or proven
to be comparable. Once the vehicle is fielded the lubricants provided in the engine shall be to
specification, therefore conformance during testing shall be assured.
Verification Guidance
Verify that the contractors records contain laboratory analysis or certification that lubricants
meet the specification requirements.
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