ASTM D7156 Standard Test Method for Evaluation of Diesel Engine Oils in the T-11 Exhaust Gas Recirculation Diesel Engine
4. Summary of Test Method
4.1 The test operation involves use of a Mack E-TECH V-MAC III diesel engine with Exhaust Gas Recirculation (EGR). Two oil flushes, each for 30 min, are followed by a test at constant speed and torque conditions for 252 h.

4.2 Take oil samples periodically and analyze for viscosity increase and soot content.

4.3 Engine rebuilds may be necessary as indicated by degradation of test parameters and are left to the discretion of the test laboratory. At rebuild, the power section of the engine is disassembled, solvent-cleaned, and rebuilt, using all new pistons, rings, cylinder liners, valves, and valve guides, in strict accordance with furnished specification.

4.4 Solvent-clean the engine crankcase and replace worn or defective parts.

4.5 Equip the test stand with appropriate accessories for controlling speed, torque, and various engine operating conditions.

5. Significance and Use
5.1 This test method was developed to evaluate the viscosity increase and soot concentration (loading) performance of engine oils in turbocharged and intercooled four-cycle diesel engines equipped with EGR. Obtain results from used oil analysis.

5.2 The test method can be used for engine oil specification acceptance when all details of the procedure are followed.