ASTM D6794 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
1. 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 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.
2. Referenced Documents
2.1 ASTM Standards:
D1193 Specification for Reagent Water
D4057 Practice for Manual Sampling of Petroleum and Petroleum Products
D4485 Specification for Performance of Engine Oils
D5844 Test Method for Evaluation of Automotive Engine Oils for Inhibition of Rusting (Sequence IID)
D5862 Test Method for Evaluation of Engine Oils in Two-Stroke Cycle Turbo-Supercharged 6V92TA Diesel Engine
E 344 Terminology Relating to Thermometry and Hydrometry
3. Terminology
3.1 Definitions:
3.1.1 calibrate, v - to determine the indication or output of a measuring device with respect to that of a standard.
3.1.2 calibration test, n - a test, using a coded oil, conducted as specified in the test method.
3.1.2.1 Discussion - The test result is used to determine the suitability of the testing facility/laboratory to conduct such tests on non-reference oils.
3.1.3 candidate oil, n - an oil that is intended to have the performance characteristics necessary to satisfy a specification and is tested against that specification.
3.1.4 engine oil, n - a liquid that reduces friction or wear, or both, between the moving parts within an engine; removes heat, particularly from the underside of pistons; and serves as a combustion gas sealant for the piston rings.
3.1.4.1 Discussion - It may contain additives to enhance certain properties. Inhibition of engine rusting, deposit formation, valve train wear, oil oxidation, and foaming are examples.
3.1.5 non-reference oil, n - any oil other than a reference oil–such as a research formulation, commercial oil, or candidate oil.
3.1.6 reference oil, n - an oil of known performance characteristics, used as a basis for comparison.
3.1.6.1 Discussion - Reference oils are used to calibrate testing facilities, to compare the performance of other oils, or to evaluate other materials (such as seals) that interact with oils.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 effective filter area, n - that surface of a test filter that can receive the material to be filtered.
3.2.2 new oil, n - an unused oil having the identical formulation and base stock as the test oil.
3.2.3 test oil, n - the new oil with various amounts of water added.
3.2.3.1 Discussion - A potential precipitate in the test oil is induced by heating the oil and aging.
