Standard Test Method for
Determination of the Ability of Lubricants to Minimize Ring
Sticking and Piston Deposits in Two-Stroke-Cycle Gasoline
Engines Other Than Outboards1
This standard is issued under the fixed designation D 4857; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of the 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.
This standard has been approved for use by agencies of the Department of Defense.
1.1 This test method2 evaluates the performance of lubricants intended for use in two-stroke-cycle spark-ignition gasoline engines that are particularly prone to ring sticking. Piston
varnish and spark plug fouling is also evaluated.
1.2 The values stated in SI units are the standard. The values
given in parentheses are provided for information only.
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.
2. Referenced Documents
2.1 ASTM Standards: 3
B 152 Specification for Copper Sheet, Strip, Plate, and
D 93 Test Methods for Flash-Point by Pensky-Martens
Closed Cup Tester
D 235 Specification for Mineral Spirits (Petroleum Spirits)
(Hydrocarbon Dry Cleaning Solvent)
D 445 Test Method for Kinematic Viscosity of Transparent
and Opaque Liquids
D 874 Test Method for Sulfated Ash from Lubricating Oils
D 2270 Practice for Calculating Viscosity Index from Kinematic Viscosity at 40 and 100°C
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