1.1 This test method is commonly referred to as the Mack T-8. This test method covers an engine test procedure for evaluating diesel engine oils for performance characteristics, including viscosity increase and soot concentrations (loading).

1.2 This test method also provides the procedure for running an extended length T-8 test, which is commonly referred to as the T-8E and an abbreviated length test, which is commonly referred to as T-8A. The procedures for the T-8E and the T-8A are identical to the T-8 with the exception of the items specifically listed in Annex A8 and Annex A9 respectively. Additionally, the procedure modifications listed in Annex A8 and Annex A9 refer to the corresponding section of the T-8 procedure.

1.3 The values stated in either SI or inch-pound units are to be regarded separately as the standard. Within the text, the inch-pound units are generally shown in parentheses when combined with SI units, and vice versa.

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. See Annex A6 for specific safety precautions.

1.5 A Table of Contents follows:

Scope	1
Referenced Documents	2
Terminology	3
Summary of Test Methods	4
Significance and Use	5
Apparatus	6
General Description	6.1
The Test Engine	6.2
Mack Test Engine	6.2.1
Engine Cooling System	6.2.2
Engine Oil System	6.2.3
Auxiliary Oil System	6.2.4
Crankcase Aspiration	6.2.5
Blowby Meter	6.2.6
Air Supply and Filtration	6.2.7
Fuel Supply	6.2.8
Intake Manifold Temperature Control	6.2.9
Engine Fluids	7
Test Oils	7.1
Test Fuel	7.2
Engine Coolant	7.3
Cleaning Materials	7.4
Preparation of Apparatus at Rebuild	8
Cleaning of Parts	8.1
Valves, Seats, Guides, and Springs	8.2
Cylinder Liner, Piston, and Piston Ring Assembly	8.3
Injectors and Injection Pump	8.4
Assembly Instructions	8.5
Measurements	8.6
Laboratory and Engine Test Stand Calibration/Non-Reference Requirements	9
Calibration Frequency	9.1
Calibration Reference Oils	9.2
Test Numbering	9.3
New Laboratories and New Test Stands	9.4
Calibrated Laboratories and Test Stands	9.5
Calibration Test Acceptance	9.6
Failing Calibration Tests	9.7
Non-Reference Oil Test Requirements	9.8
Procedure	10
Pretest Procedure	10.1
Engine Start-Up	10.2
Engine Shutdown	10.3
Test Cycle	10.4
Oil Addition/Drain	10.5
Oil Samples	10.6
Oil Consumption Calculations	10.7
Fuel Samples	10.8
Periodic Measurements	10.9
Blowby	10.10
Centrifugal Oil Filter Mass Gain	10.11
Oil Filter ∇P Calculation	10.12
Post Test	10.13
Inspection of Fuel and Oil During Test	11
Oil Inspection	11.1
Fuel Inspections	11.2
Oil Consumption	11.3
Report	12
Reporting Test Results	12.1
Deviations from Test Operational Limits	12.2
Electronic Transmission of Test Results	12.3
Plots of Operational Data	12.4
Precision and Bias	13
Precision	13.1
Bias	13.2
Keywords	14
Annexes
Report Forms	Annex A1
Sensor Locations	Annex A2
Kinematic Viscosity At 100°C For Test Method D 5967 Samples	Annex A3
Enhanced Thermal Gravimetric Analysis (TGA) Procedure	Annex A4
Procurement of Test Materials	Annex A5
Safety Precautions	Annex A6
Data Dictionary	Annex A7
T-8E Extended Length Test Requirements	Annex A8
T-8A Abbreviated Length Test Requirements	Annex A9