ASTM D3525-20

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D3525 − 20
Standard Test Method for
Gasoline Fuel Dilution in Used Gasoline Engine Oils by
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Wide-Bore Capillary Gas Chromatography
This standard is issued under the fixed designation D3525; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
1.1 This test method describes a gas chromatographic tech-
nique for determining the amount of gasoline fuel dilution in
2. Referenced Documents
used lubricating oils arising from their use in gasoline engines.
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2.1 ASTM Standards:
1.2 This test method is limited to gas chromatographs
E355 Practice for Gas ChromatographyTerms and Relation-
accommodating wide-bore (0.53 mm) capillary columns and
ships
that are equipped with flame ionization detectors (FIDs) and
E594 Practice for Testing Flame Ionization Detectors Used
temperature programmable ovens.
in Gas or Supercritical Fluid Chromatography
E1510 Practice for Installing Fused Silica Open Tubular
1.3 There is no limitation regarding the fuel dilution con-
centration range that can be determined by this method, Capillary Columns in Gas Chromatographs
however the precision statements apply only to the concentra-
3. Terminology
tion range of 0.5 % to 20.3 % gasoline. A reporting limit of
3.1 Definitions:
0.5 % gasoline fuel dilution has also been included in the
3.1.1 For definition of gas chromatography terms, refer to
method.
Practice E355.
1.4 Lubricating fluids recovered from engine crankcases
3.2 Definitions of Terms Specific to This Standard:
have undergone changes due to heating, volatilization,
3.2.1 fuel diluent, n—in used oil analysis, unburned fuel
sheering, oxidation and other reactions, and, as a result, the
components that enter the engine crankcase causing dilution of
chromatographic profiles of the gasoline diluents and engine
the oil.
oils often differ significantly from their original patterns.
3.2.1.1 Discussion—In this method, the fuel diluent compo-
Caution is accordingly advised when comparing quantitative
nents being determined originate from gasoline.
determinations made using new verses used or in-service
3.2.2 fuel dilution, n—the amount, expressed as a
materials.
percentage, of gasoline found in engine lubricating oil.
1.5 The values stated in SI units are to be regarded as
3.2.2.1 Discussion—Fuel dilution may be the result of
standard. No other units of measurement are included in this
engine wear or improper performance.
standard.
3.3 Abbreviations:
1.6 This standard does not purport to address all of the
3.3.1 Acommonabbreviationofhydrocarboncompoundsis
safety concerns, if any, associated with its use. It is the
to designate the number of carbon atoms in the compound. A
responsibility of the user of this standard to establish appro-
prefix is used to indicate the carbon chain form, while a
priate safety, health, and environmental practices and deter-
subscripted suffix denotes the number of carbon atoms.
mine the applicability of regulatory requirements prior to use.
Example:
1.7 This international standard was developed in accor-
normal hexadecane n-C
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dance with internationally recognized principles on standard-
iso-tetradecane i-C
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ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom- 4. Summary of Test Method
4.1 A gas chromatographic technique is described for ana-
lyzing used engine oils by adding a known amount of
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This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of
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Subcommittee D02.B0 on Automotive Lubricants. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved June 15, 2020. Published July 2020. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1976. Last previous edition approved in 2016 as D3525 – 04 (2016). Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/D3525-20. the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D3525 − 20
TABLE 1 Typical Instrument Operating Conditions
Wide-Bore Capillary Column
Column l
...