This test method was developed to evaluate the viscometric performance of engine oils in turbocharged and intercooled four-cycle diesel engines. Results are obtained from used oil analysis.
The test method is used for engine oil specification acceptance when all details of the procedure are followed.
1.1 This test method covers an engine test procedure for evaluating diesel engine oils for performance characteristics, including viscosity increase and soot concentrations (loading). This test method is commonly referred to as the Mack T-8.
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 Method | 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 Oil | 7.1 |
| Test Fuel | 7.2 |
| Engine Coolant | 7.3 |