ASTM D7097-16a
Standard Test Method for Determination of Moderately High Temperature Piston Deposits by Thermo-Oxidation Engine Oil Simulation Test&x2014;TEOST MHT

Standard No.

ASTM D7097-16a

Release Date

2016

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM D7097-19

Latest

ASTM D7097-19

Scope

5.1 The test method is designed to predict the deposit-forming tendencies of engine oil in the piston ring belt and upper piston crown area. Correlation has been shown between the TEOST MHT procedure and the TU3MH Peugeot engine test in deposit formation. Such deposits formed in the ring-belt area of a reciprocating engine piston can cause problems with engine operation and longevity. It is one of the required test methods in Specification D4485 to define API Category-Identified engine oils.6

1.1 This test method covers the procedure to determine the mass of deposit formed on a specially constructed test rod exposed to repetitive passage of 8.58201;g of engine oil over the rod in a thin film under oxidative and catalytic conditions at 2858201;°C. The range of applicability of the Moderately High Temperature Thermo-Oxidation Engine Test (TEOST MHT2) test method as derived from an interlaboratory study is approximately 108201;mg to 1008201;mg. However, experience indicates that deposit values from 18201;mg to 1508201;mg or greater may be obtained.

1.2 This test method uses a patented instrument, method and patented, numbered, and registered depositor rods traceable to the manufacturer3 and made specifically for the practice and precision of the test method.4

1.3 The values stated in SI units are to be regarded as standard.

1.3.1 Although not an SI unit, the special name liter (L) is allowed by SI for the cubic decimeter (dm³) and the milliliter (mL) for the SI cubic centimeter (cm³). Likewise, the special name millimeter (mm) is allowed by SI as a measurement of length.

1.4 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.

ASTM D7097-16a Referenced Document

• ASTM D4485 Standard Specification for Performance of Active API Service Category Engine Oils
• ASTM D6335 Standard Test Method for Determination of High Temperature Deposits by Thermo-Oxidation Engine Oil Simulation Test

ASTM D7097-16a history

• 2019 ASTM D7097-19 Standard Test Method for Determination of Moderately High Temperature Piston Deposits by Thermo-Oxidation Engine Oil Simulation Test—TEOST MHT
• 2016 ASTM D7097-16a Standard Test Method for Determination of Moderately High Temperature Piston Deposits by Thermo-Oxidation Engine Oil Simulation Test&x2014;TEOST MHT
• 2016 ASTM D7097-16 Standard Test Method for Determination of Moderately High Temperature Piston Deposits by Thermo-Oxidation Engine Oil Simulation Test&x2014;TEOST MHT
• 2009 ASTM D7097-09 Standard Test Method for Determination of Moderately High Temperature Piston Deposits by Thermo-Oxidation Engine Oil Simulation Test-TEOST MHT
• 2006 ASTM D7097-06a Standard Test Method for Determination of Moderately High Temperature Piston Deposits by Thermo-Oxidation Engine Oil Simulation Test-TEOST MHT
• 2006 ASTM D7097-06 Standard Test Method for Determination of Moderately High Temperature Piston Deposits by Thermo-Oxidation Engine Oil Simulation Test-TEOST MHT
• 2005 ASTM D7097-05 Standard Test Method for Determination of Moderately High Temperature Piston Deposits by Thermo-Oxidation Engine Oil Simulation Test-TEOST MHT