MIL-PRF-21260E
c. Final test. Repeat procedures under initial test.
d. High temperature engine oil aeration test (ASTM D 6092). Test oil in accordance
with ASTM D6082. Not more then 50 mL of foam shall remain immediately
following the end of the blowing period. No foam shall remain at the end of the
1-minute settling period.
4.3.3.2.1 HEUI engine oil aeration test. The HEUI engine oil aeration test shall be
required only when a satisfactory high temperature engine oil aeration test is not available.
Satisfactory performance shall be demonstrated when the oils exhibit test results meeting the
following criteria:
% max.
HEUI foam stability @ 20 hrs.
10
4.3.3.3 Oxidation and wear protection test. The oils shall be tested in accordance with
ASTM D5533 and shall exhibit results (single or average) meeting the following criteria:
3 Tests
Average rating @ 64 hours
1 Test
2 Tests
Viscosity increase, hour to 375% average (avg.) min.
67.5
65.1
64.0
Oil ring land deposits, avg. min.
2.6
2.6
2.6
Piston skirt varnish, avg. min.
8.7
8.7
8.7
Sludge, avg. min.
9.0
9.0
9.0
Stuck rings, avg. min.
none
none
none
Stuck lifter, avg. max.
none
none
none
Scuffing and wear at 64 hours
Cam or lifter scuffing
none
none
none
Cam plus lifter wear, micrometers (µm)
avg. min.
64
64
64
avg. max.
145
145
145
4.3.3.4 Soot protection test. The oils shall be tested in accordance with ASTM D5966
and shall exhibit results meeting the following criteria:
1 Test
2 Tests
3 Tests
Pin wear, µm avg. max.
11.4
12.4
12.7
4.3.3.5 Ring-sticking, wear, and accumulation of deposits tests. Test all oils as specified
in 4.3.3.5.1 and 4.3.3.5.2. Only SAE grade 30, 40, and 15W-40 oils shall be tested as specified
in 4.3.3.5.3.
13
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