MIL-PRF-21260E
Table III. Finished oil property test methods.
Test methods
FED-STD-791
Property
or equivalent (see
ASTM
SAE
4.3.1)
Viscosity, kinematic
D445
Viscosity, apparent
J300, appendix A
High
D4683, D4624, D4741
temperature/shear
Viscosity index
D2270
Pour point
D97
Stable pour point 1/
203
Pumpability
D4684
Flash point
D92
Evaporative loss 2/ 3/
D5480, D5800
Gravity, API
D287
Carbon residue
D524
TAN
D664
TBN
D2896, D4739
Phosphorus
D1091, D4047, D4951,
D5185
Sulfur 4/
D129, D1552, D2622,
D4294, D4297, D4951,
D5185
Nitrogen
D3228, D4629
Sulfated ash
D874
Metallic components
D4628, D4927, D4951,
D5185
1/ Test is only required for SAE grades 10W and 15W-40 oils.
2/ ASTM D5480 is the preferred method.
3/ After being cooled down to its pour point, the oil shall regain its homogeneity on standing at a
temperature not more than 6°C above the pour point. However, it should not exceed the indicated
limits.
4/ ASTM D1552 is the preferred method. ASTM D4294 is only for use with base stock.
4.3.3.2 Foaming test. All grades of oil shall be subject to the following tests and shall
exhibit the correlative results:
a. Initial test. Test oils in accordance with sequence I of ASTM D892. Not more than
10 milliliters (mL) of foam shall remain immediately following the end of the 5 minute
blowing period. No foam shall remain at the end of the 10 minute settling period.
b. Intermediate test. Test oils in accordance with sequence II of ASTM D892. Not more
than 20 milliliters (mL) of foam shall remain immediately following the end of the 5
minute blowing period. No foam shall remain at the end of the 10 minute settling period.
Option A is not allowed.
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