Beginning in October 2002, more stringent exhaust emission requirements were implemented
for on-highway engines. To meet these requirements, cooled exhaust gas recirculation (EGR)
technology was used in addition to the existing retarded fuel injection timing. The DDC PGOS
approved engine oils have been formulated to address these issues. It is anticipated that these new
oils provide the capability of maintaining the oil drain intervals
The used oil limits for extended oil drain are
Adjusted oil drain intervals will depend on the engine's rate of soot generation and the engine oil's
capability to protect the engine. In some cases, it will be necessary to shorten oil drain intervals
from the baseline oil drains, while in others it may be possible to operate at the maximum oil drain
intervals.
Soot accumulations in the engine oil exceeding the capability of the
oil formulation can result in increased wear and reduced engine durability. DDC recommends used
oil analysis to determine the proper oil drain interval for these engines and oils. The oil analysis
properties and limits should be considered when establishing oil drain intervals for these engines.
Used Oil Property Test Method Limit
Soot % TGA (E1131), FTIR* 4.5 max.
Kinematic Viscosity, 100 C D445 25 CSt max
Iron, ppm D5185 200
* Infrared Spectroscopy may be used, provided it is calibrated to be equivalent to TGA. DDC must approve
the equivalency
Used Oil Drain Limits for Series 50 and Series 60 On-Highway
Engines
The oil drain intervals are based on engine hours and fuel consumption.
