Standard Test Method for
Gasoline Diluent in Used Gasoline Engine Oils by Gas
This standard is issued under the fixed designation D 3525; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of the last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1.1 This test method utilizes gas chromatography to determine the amount of dilution used in gasoline fuel engine oils.
1.2 This test method is limited to gas chromatographs
equipped with a flame ionization detector and programmable
NOTE 1—The use of other detectors and instrumentation has been
reported. However, the precision statement applies only when the instrumentation specified is employed.
1.3 The applicability of this method to gelled used engine
oils have not been adequately investigated to ensure compliance
with the indicated repeatability and reproducibility. Gelled oils
are defined as oils that develop a structure on standing, but that
return to their original fluidity with light agitation.
1.4 The values stated in SI units are to be regarded as the
standard. Inch-pound units are provided for information only.
1.5 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2.1 Definitions of Terms Specific to This Standard:
2.1.1 fuel dilution—the amount, expressed as a percentage,
of engine fuel found in engine lubricating oil. This may be the
result of engine wear or improper performance.
2.2.1 A common abbreviation of hydrocarbon compounds is
to designate the number of carbon atoms in the compound. A
prefix is used to indicate the carbon chain form, while a
subscripted suffix denotes the number of carbon atoms.
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