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MIL-PRF-2104 Lubricating Oil, Internal Combustion Engine, Combat/Tactical ServiceThis performance specification covers lubricating oils suitable for lubrication of all reciprocating compression-ignition internal combustion engines \(with the exception that the 10W grade should not be used in high output 2-cycle engines\) and for power transmission fluid applications in combat/tactical service equipment \(see 6.1\).

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MIL-PRF-2104J
TABLE II. Cylinder liner, piston and bearing wear (T-10).
Primary performance criteria
Rated or measured parameter
One-Test
Two-Test
Three-Test
Liner wear, µm, max
32
34
35
Ring wear, mg, max
150
159
163
Lead content at EOT, mg/kg, max
50
56
59
Merit rating, min (15W-40 only)
1000
1000
1000
3.4.1.2 Foaming/Aeration. All grades shall reduce the potential for loss of oil
pressure or film and the associated malfunction or damage of oil operated and
lubricated components when tested in accordance with of Table III and IV. See section
4.3.2 for the verification test methods.
TABLE III. Properties of foaming.
Rated or measured parameter
Primary performance criteria
Sequence I, foaming/settling, mLA, max
10/0
Sequence II, foaming/settling, mL, max
20/0
Sequence III, foaming/settling, mL, max
10/0
A
milliliter
TABLE IV. Properties of aeration.
Rated or measured parameter
Primary performance criteria
Aeration (EOAT)A, volume, %, max
8.0 (MTAC)B
A
Engine Oil Aeration Test
B
Multiple Test Acceptance Criteria (MTAC) is a data based approach for evaluation of the quality and performance
of a formulation where more than one test may be run. See ASTM D 4485, Annex A1 for additional information.
3.4.1.3 Piston deposit and scuffing control. All grades shall prevent the buildup
of ring belt deposits on pistons, including those of the piston crown and lands, piston
ring grooves, piston undercrown and piston skirts. Oil grades 10W, 30, and 40 shall
comply with the requirements of Table V and Table VI. Oil grade 15W-40 shall comply
with the requirements of Table V and, Table VI or Table VII. See section 4.3.3 for the
verification test methods.
TABLE V. Piston deposit and scuffing control ­ aluminum piston (1K).
Primary performance criteria
Rated or measured parameter
One-Test
Two-Test
Three-Test
Weighted demerits (WDP), max
332
347
353
Top groove fill (TGF), %, max
24
27
29
Top land heavy carbon (TLHC), %, max
4
5
5
Average oil consumption, g/MJA (0-250 hB), max
0.139
0.139
0.139
Piston, ring, and liner scuffing
None
None
None
A
grams per megajoule
B
hour
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