ASTM D6335-98
(Test Method)Standard Test Method for Determination of High Temperature Deposits by Thermo-Oxidation Engine Oil Simulation Test
Standard Test Method for Determination of High Temperature Deposits by Thermo-Oxidation Engine Oil Simulation Test
SCOPE
1.1 This test method covers the procedure to determine the amount of deposits formed by automotive engine oils utilizing the thermo-oxidation engine oil simulation test (TEOST). An interlaboratory study has determined it to be applicable over the range from 10 to 65 mg total deposits.
Note 1-Operational experience with the test method has shown the test method to be applicable to engine oils having deposits over the range from 2 to 180 mg total deposits.
1.2 The values stated in SI units are to be regarded as the 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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: D 6335 – 98 An American National Standard
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
Determination of High Temperature Deposits by Thermo-
1
Oxidation Engine Oil Simulation Test
This standard is issued under the fixed designation D 6335; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 2.1.6 pump—the gear pump that controls the flow rate of
sample through the depositor rod casing.
1.1 This test method covers the procedure to determine the
2.1.7 pump inlet tube—the tube connecting the reactor
amount of deposits formed by automotive engine oils utilizing
2 3
chamber to the pump.
the thermo-oxidation engine oil simulation test (TEOST ). An
4
2.1.8 pump outlet tube—the tube connecting the pump to
interlaboratory study has determined it to be applicable over
the depositor rod casing.
the range from 10 to 65 mg total deposits.
2.1.9 reactor chamber—the reservoir that contains the bulk
NOTE 1—Operational experience with the test method has shown the
of the sample throughout the test. It has a drain valve for
test method to be applicable to engine oils having deposits over the range
removing sample at the end of the test and an inlet valve for
from 2 to 180 mg total deposits.
adding gases to the sample. The chamber contains a magnetic
1.2 The values stated in SI units are to be regarded as the
stir bar well in the bottom in which a stir bar is placed to mix
standard.
the reactor contents.
1.3 This standard does not purport to address all of the
2.1.10 rod o-rings—the o-rings that seal the outside of the
safety concerns, if any, associated with its use. It is the
rod and the depositor rod casing to prevent sample leaks.
responsibility of the user of this standard to establish appro-
2.1.11 side nut—the fitting creates a seal to prevent sample
priate safety and health practices and determine the applica-
leaking from the front holes of the depositor rod casing.
bility of regulatory limitations prior to use.
2.1.12 thermocouple lock collar—a fitting that tightens on
the thermocouple to ensure the thermocouple is at the correct
2. Terminology
depth when placed inside the rod.
2.1 Definitions of Terms Specific to This Standard:
2.1.13 rod deposits—the mass in mg of the deposits col-
2.1.1 ceramic isolator—the fitting that compresses the
lected on the depositor rod.
o-ring into the depositor rod casing and isolates the depositor
2.1.14 filter deposits—the mass in mg of the deposits
rod casing from the voltage applied to the depositor rod.
collected on the filter cartridge.
2.1.2 depositor rod—the steel rod on which the deposits are
2.1.15 total deposits—the rod deposits plus the filter depos-
collected. It is resistively heated through a temperature cycle
its.
during the test.
2.1.3 depositor rod casing—the sleeve that surrounds the 3. Summary of Test Method
depositor rod and allows the flow of specimen around the
3.1 A sample of the engine oil at a temperature of 100°C
outside of the rod.
that contains ferric napthenate and is in contact with nitrous
2.1.4 drain tube—the tube connecting the outlet of the
oxide and moist air is pumped at a set flow rate past a tared
depositor rod casing to the reaction chamber.
depositor rod. The rod is resistively heated through twelve, 9.5
2.1.5 end cap—the fitting to tighten the ceramic isolators
min temperature cycles that go from 200 to 480°C. When the
down onto the o-rings at the ends of the depositor rod casing.
twelve cycle program is complete, the depositor rod rinsed of
oil residue and dried and the gross rod mass obtained. The
sample is flushed from the system and filtered through a tared
1
This guide is under the jurisdiction of ASTM Committee D-2 on Petroleum
filter. The mass of deposits on the rod plus the mass of deposits
Products and Lubricants and is the direct responsibility of Subcommittee D02.09.0G
on the filter is the total deposit mass.
on Response of Base Oil to Oxidation Inhibitors.
Current edition approved Nov. 10, 1998. Published March 1999.
2
4. Significance and Use
TEOST is a trademark of the Tannas Co. (Reg. 2001396).
3
The Development of Thermo-Oxidation Engine Oil Simulation Test (TEDST),
4.1 The test method is designed to predict the high tempera-
Society of Automotive Engineers (SAE No. 932837), 400 Commonwealth Dr.,
ture deposit forming tendencies of an engine oil. This test
Warrendale, PA 15096-0001.
4
Supporting data are available from ASTM Headquarters. Request RR:
D02–1391.
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