Standard Historical Last Updated: Dec 31, 2010 Track Document
ASTM D6618-08

Standard Test Method for Evaluation of Engine Oils in Diesel Four-Stroke Cycle Supercharged 1M-PC Single Cylinder Oil Test Engine

Standard Test Method for Evaluation of Engine Oils in Diesel Four-Stroke Cycle Supercharged 1M-PC Single Cylinder Oil Test Engine D6618-08 ASTM|D6618-08|en-US Standard Test Method for Evaluation of Engine Oils in Diesel Four-Stroke Cycle Supercharged 1M-PC Single Cylinder Oil Test Engine Standard new BOS Vol. 05.03 Committee D02
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Significance and Use

The test method is designed to relate to high-speed, supercharged diesel engine operation and, in particular, to the deposit control characteristics and antiwear properties of diesel crankcase lubricating oils.

The test method is useful for the evaluation of diesel engine oil quality and crankcase oil specification acceptance. This test method, along with others, defines the minimum performance level of the API categories CF and CF-2 (detailed information about passing limits for these categories is included in Specification D 4485). It is also used in MIL-PRF-2104.

The results are significant only when all details of the procedure are followed. The basic engine used in this test method has a precombustion chamber (as compared to direct injection) and is most useful in predicting performance of engines similarly equipped. This factor should be considered when extrapolating test results. It has been found useful in predicting results with high sulfur fuels (that is, greater than 0.5 wt %) and with certain preemission controlled engines. It has also been found useful when correlated with deposit control in two-stroke cycle diesel engines.


1.1 This test method covers a four-stroke cycle diesel engine test procedure for evaluating engine oils for certain high-temperature performance characteristics, particularly ring sticking, ring and cylinder wear, and accumulation of piston deposits. Such oils include both single viscosity SAE grade and multiviscosity SAE grade oils used in diesel engines. It is commonly known as the 1M-PC test (PC for Pre-Chamber) and is used in several API oil categories, notably the CF and CF-2 and the military category described in MIL-PRF-2104 (see Note 1).

Note 1—Companion test methods used to evaluate other engine oil performance characteristics for API oil categories CF and CF-2 are discussed in SAE J304. The companion tests used by the military can be found in MIL-PRF-2104.

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

1.4 This test method is arranged as follows:

Reference Documents2
Summary of Test Method4
Significance and Use5
Test Engine6.1
Engine Accessories6.2-6.14
Engine Oil System6.15
Cooling System6.16
Fuel System6.17
Intake Air System6.18
Exhaust System6.19
Blowby Meter6.20
Crankcase Paint6.24
Reagents and Materials7
Test Oil7.2
Engine Coolant7.3
Cleaning Materials7.4
Preparation of Apparatus9
Supplementary Service Information9.1
General Engine Inspection9.2
Intake Air System9.3
Cooling System9.4
Engine Cooling System Cleaning9.5
Instrumentation Calibration Requirements9.6
Engine Crankcase Cleaning9.7
Additional Oil Filter9.8
Flushing Procedure Components9.9
Flushing Procedures9.10
Piston Cleaning Preparation9.11
Cylinder Head9.12
Fuel Nozzle9.13
Engine Break-in10.1
Pre-Test Preparations10.2
Warm-up Procedure10.3
Operating Conditions10.4
Periodic Measurements10.5
Engine Oil Level10.6
Oil Addition Procedure10.7
Cool-Down Procedure10.8
Fuel System10.10
Brake Specific Oil Consumption (BSOC) Calculation10.11
Rater Training11.3
Referee Ratings11.4
Calibration of Test Method12
Reference Oils12.2
Test Numbering12.3
Definition of a Test12.4
New Laboratories and New Test Stands12.5
Frequency of Calibration Tests12.6
Specified Test Parameters12.10
Acceptance of Calibration Tests12.11
Failing Reference Oil Calibration Tests12.12
Non-Standard Tests12.13
Severity Adjustments and Control Charting12.14
Test Reporting12.15
Reporting Reference Results12.16
Analysis of Reference Oils12.17
Precision and Bias13
Figures and SchematicsAnnex A1
Report FormsAnnex A2
Test Fuel InformationAnnex A3
Humidity Correction FactorsAppendix X1
Report Form ExamplesAppendix X2
1M-PC Multiple TestingAppendix X3

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Book of Standards Volume: 05.03
Developed by Subcommittee: D02.B0.02
Pages: 54
DOI: 10.1520/D6618-08
ICS Code: 75.100