TM 5-3895-346-14
ENGINE OVERHAUL
FUEL AND OIL SPECIFICATIONS
Used Lube Oil Analysis Warning Values
The presence of ethylene glycol in the oil is damaging to the engine. Its presence and need for an oil change
and for corrective maintenance action may be confirmed by glycol detector kits which are commercially
available.
Fuel dilution of the oil may result from loose fuel connections or from prolonged engine idling. A fuel dilution
exceeding 2.57%of volume indicates an immediate need for an oil change and corrective maintenance action.
Fuel dilution may be confirmed by ASTM D-322 test procedure performed by oil suppliers or independent
laboratories.
In addition to the above considerations, if any of the following occur, the oil should be changed:
1. The viscosity at 100 of a used oil sample is 40% greater than the viscosity of the unused oil measured
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at the same temperature (ASTM D-445 and D-2161).
2. The iron content is greater than 150 parts per million.
3. The coagulated pentane insolubles (total contamination) exceed 1.00% by weight (ASTM D-893).
4. The total base number (TBN) is less than 1.0 (ASTM D-664).
NOTE
The sulfur content of the diesel fuel used will influence the alkalinity of the lube oil.
With high sulfur fuels, the oil drain interval will have to be shortened to avoid
excessive acidity in the lube oil.
LUBE OIL FILTER ELEMENT CHANCES
Full-Flow Filters
A full-flow oil filtration system is used in all Detroit Diesel engines. To ensure against physical deterioration of
the filter element it should be replaced at a maximum of 25,000 miles for on-highway vehicles or at each oil
change period, whichever occurs first. For all other applications, the filter should be replaced at a maximum of
500 hours or at each oil change period, whichever occurs first.
By-Pass Filters
Auxiliary by-pass lube oil filters are not required on Detroit Diesel engines.
STATEMENT OF POLICY ON FUEL AND LUBRICANT ADDITIVES
In answer to requests concerning the use of fuel and lubricating oil additives, the following excerpt has been
taken from a policy statement of General Motors Corporation:
"t has been and continues to be General Motors policy to build
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motor vehicles that will operate satisfactorily on the commercial
fuels and lubricants of good quality regularly provided by the
petroleum industry through retail outlets."
Therefore, Detroit Diesel Allison does not recommend the use of any supplementary fuel or lubricant additives.
These include all products marketed as fuel conditioners, smoke suppressants, masking agents, reodorants,
tuneup compounds, top oils, break-in oils, graphitizers, and friction-reducing compounds.
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