D664_10 (17a) 04-2018
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When applicable,
refer to practice
D4057, Manual
Sampling, or practice
D4177, Automatic Sampling, for
proper sampling techniques.
When sampling used
lubricants, the specimen
shall be representative
of the system sampled
and shall be free
of contamination
from external sources.
Agitate used oil
samples thoroughly
to ensure that any sediment
present is homogeneously
suspended before analysis,
as the sediment can
be acidic or basic,
or have absorbed
acidic or basic material
from the sample.
When necessary, samples
are warmed to aid mixing.
As used oil can change
appreciably in storage,
samples should be tested
as soon as possible
after removal from the
lubricating system.
And the dates of sampling
and testing, if known,
should be noted.