ASTM D6335-03b

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An American National Standard
Designation:D6335–03b
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 filter deposits—the mass in mg of the deposits col-
lected on the filter cartridge.
1.1 This test method covers the procedure to determine the
2.1.7 pump—the gear pump that controls the flow rate of
amount of deposits formed by automotive engine oils utilizing
2 3 sample through the depositor rod casing.
the thermo-oxidation engine oil simulation test (TEOST ). An
4
2.1.8 pump inlet tube—the tube connecting the reactor
interlaboratory study has determined it to be applicable over
chamber to the pump.
the range from 10 to 65 mg total deposits.
2.1.9 pump outlet tube—the tube connecting the pump to
NOTE 1—Operational experience with the test method has shown the
the depositor rod casing.
test method to be applicable to engine oils having deposits over the range
2.1.10 reactor chamber—the reservoir that contains the
from 2 to 180 mg total deposits.
bulk of the sample throughout the test. It has a drain valve for
1.2 The values stated in SI units are to be regarded as the
removing sample at the end of the test and an inlet valve for
standard.
adding gases to the sample. The chamber contains a magnetic
1.3 This standard does not purport to address all of the
stir bar well in the bottom in which a stir bar is placed to mix
safety concerns, if any, associated with its use. It is the
the reactor contents.
responsibility of the user of this standard to establish appro-
2.1.11 rod deposits—the mass in mg of the deposits col-
priate safety and health practices and determine the applica-
lected on the depositor rod.
bility of regulatory limitations prior to use.
2.1.12 rod o-rings—the o-rings that seal the outside of the
rod and the depositor rod casing to prevent sample leaks.
2. Terminology
2.1.13 side nut—the fitting creates a seal to prevent sample
2.1 Definitions of Terms Specific to This Standard:
leaking from the front holes of the depositor rod casing.
2.1.1 ceramic isolator—the fitting that compresses the
2.1.14 thermocouple lock collar—a fitting that tightens on
o-ring into the depositor rod casing and isolates the depositor
the thermocouple to ensure the thermocouple is at the correct
rod casing from the voltage applied to the depositor rod.
depth when placed inside the rod.
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
1
sample is flushed from the system and filtered through a tared
This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee filter.The mass of deposits on the rod plus the mass of deposits
D02.09 on Oxidation.
on the filter is the total deposit mass.
Current edition approved May 10, 2003. Published July 2003. Originally
approved in 1998. Last previous edition approved in 2003 as D 6335–03a.
4. Significance and Use
2
TEOST is a trademark of the Tannas Co. (Reg. 2001396).
3
The Development of Thermo-Oxidation Engine Oil Simulation Test (TEOST),
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.
method can be used to screen oil samples or as a quality
4
Supporting data have been filed at ASTM International Headquarters and may
assurance tool.
be obtained by requesting Research Report RR: D02–1391.
*A Summar
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