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September - October 2017
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13
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the lubricant at 75 percent of the end of
the RPVOT time (25 percent of the new
oil's value) for both the PAG and mineral
oil examples.
In-service Samples
Now the question becomes what do you
see in the field. Is the field behavior of the
lubricants the same as the bench oxidation
tests? Field samples are difficult to obtain
for many reasons, not the least of which is
the time required to generate them.
In examining the data below, you can see
the same trends in the field as in the bench
testing of the lubricants. This should provide
confidence in bench testing and allow for
rational conclusions about the lubricants
being studied.
A Better Approach
When evaluating new lubricants, it can be
difficult to determine whether the information
being advertised by manufacturers is valid. A
better approach is to utilize these standard
performance tests that have been used success-
fully in the industry for years. They can enable
you to make better business decisions and help
optimize your lubrication program.
In-service field samples
TESTING SERIES AN (ASTM D974)
DEMULSIBILITY
(ASTM D1401)
RPVOT
(ASTM D2272)
MPC
(ASTM D7843)
(RUL 1)
AMINE
(RUL 2)
PHENOL
8-year-old
PAG
0.34 0-2-78 (30) 468 9 38077
82%
5-year-old
Mineral Oil 1
0.11 40-40-0 (25) 1304 20.3 5775
98%
12- to 14-year-old
Mineral Oil 1
0.11 30-38-12 (30) 1312 18.0 4169
71%
4-year-old
Mineral Oil 2
0.01 42-38-0 (20) 1344 22.3 1262.5 4919
19% 74%
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