ASTM D6794-20e1

Standard Test Method for Measuring the Effect on Filterability of Engine Oils After Treatment with Various Amounts of Water and a Long (6 h) Heating Time

SIGNIFICANCE AND USE
5.1 It is normal for some of the combustion products of an internal combustion engine to penetrate into the engine lubricant and be retained in it.  
5.2 When an engine is run for a period of time and then stored over a long period of time, the by-products of combustion might be retained in the oil in a liquefied state.  
5.3 Under these circumstances, precipitates can form that impair the filterability of the oil the next time the engine is run.  
5.4 This test method subjects the test oil and the new oil to the same treatments such that the loss of filterability can be determined. The four water treatment levels may be tested individually, all four simultaneously, or any combination of multiple water treatment levels.  
5.5 Reference oils, on which the data obtained by this test method is known, are available.  
5.6 This test method requires that a reference oil also be tested and results reported. Two oils are available, one known to give a low and one known to give a high data value for this test method.
Note 1: When the new oil test results are to be offered as candidate oil test results for a specification, such as Specification D4485, the specification will state maximum allowable loss of filterability (flow reduction) of the test oil as compared to the new oil.
SCOPE
1.1 This test method covers the determination of the tendency of an oil to form a precipitate that can plug an oil filter. It simulates a problem that may be encountered in a new engine run for a short period of time, followed by a long period of storage with some water in the oil.  
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 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.

General Information

• Status: Published
• Publication Date: 30-Apr-2020
• ICS: 75.100 - Lubricants, industrial oils and related products
• Technical Committee: D02 - Petroleum Products, Liquid Fuels, and Lubricants
• Drafting Committee: D02.B0 - Automotive Lubricants

Standards Content (Sample)

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.
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Designation: D6794 − 20
Standard Test Method for
Measuring the Effect on Filterability of Engine Oils After
Treatment with Various Amounts of Water and a Long (6 h)
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Heating Time
This standard is issued under the fixed designation D6794; 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.
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ε NOTE—Editorially updated TMC governance information in June 2022.
INTRODUCTION
Portions of this test method are written for use by laboratories that make use of ASTM Test
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Monitoring Center (TMC) services (see Annex A1).
TheTMC provides reference oils, and engineering and statistical services to laboratories that desire
to produce test results that are statistically similar to those produced by laboratories previously
calibrated by the TMC.
In general, the Test Purchaser decides if a calibrated test stand is to be used. Organizations such as
theAmerican Chemistry Council require that a laboratory utilize theTMC services as part of their test
registration process. In addition, the American Petroleum Institute and the Gear Lubricant Review
Committee of the Lubricant Review Institute (SAE International) require that a laboratory use the
TMC services in seeking qualification of oils against their specifications.
The advantage of using the TMC services to calibrate test stands is that the test laboratory (and
hence the Test Purchaser) has an assurance that the test stand was operating at the proper level of test
severity. It should also be borne in mind that results obtained in a non-calibrated test stand may not
be the same as those obtained in a test stand participating in the ASTM TMC services process.
Laboratories that choose not to use the TMC services may simply disregard these portions.
ASTM International policy is to encourage the development of test procedures based on generic
equipment. It is recognized that there are occasions where critical/sole-source equipment has been
approved by the technical committee (surveillance panel/task force) and is required by the test
procedure. The technical committee that oversees the test procedure is encouraged to clearly identify
if the part is considered critical in the test procedure. If a part is deemed to be critical, ASTM
encourages alternative suppliers to be given the opportunity for consideration of supplying the critical
part/component providing they meet the approval process set forth by the technical committee.
An alternative supplier can start the process by initiating contact with the technical committee
(current chairs shown on ASTM TMC website). The supplier should advise on the details of the part
that is intended to be supplied. The technical committee will review the request and determine
feasibility of an alternative supplier for the requested replacement critical part. In the event that a
replacement critical part has been identified and proven equivalent, the sole-source supplier footnote
shall be removed from the test procedure.
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For other information, refer to the research report of this test method.
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This test method is under the jurisdiction of ASTM Committee D02 on
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Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of ASTMTestMonitoringCenter,203ArmstrongDrive,Freeport,PA16229.This
Subcommittee D02.B0 on Automotive Lubricants. test method is supplemented by Information Letters and Memoranda issued by the
Current edition approved May 1, 2020. Published May 2020. Originally ASTM Test Monitoring Center. This edition includes all information letters through
approved in 2002. Last previous edition approved in 2019 as D6794 – 19. DOI: No. 19-2. Users of this test method can contact the ASTM Test Monitoring Center
10.1520/D6794-20E01. to obtain the most recent of these.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D6794 − 20
1. Scope* 3.1.3.1 Discussion—It may contain additives to enhance
certain properties. Inhibition of engine rusting, deposit
1.1 This test method covers the determination of the ten-
formation, valve train wear, oil oxidation, and foaming are
dency of an oil to form a precipitate that can plug an oil filter.
examples.
Itsimulatesaproblemthatmaybeencounteredinanewengine
3.1.4 engine oil, n—a liquid that reduces friction or wear, or
run for a short period of time, followed by a long period of
both, between the movin
...