Operation and maintenance manual

Lubricating Oil Recommendations and Specifications QSB4.5 and QSB6.7
Page V-12 Section V - Maintenance Specifications
As the engine oil becomes contaminated, essential oil
additives are depleted. Lubricating oils protect the engine
as long as these additives are functioning properly.
Progressive contamination of the oil between oil and filter
change intervals is normal. The amount of contamination
will vary depending on the operation of the engine,
kilometers or miles on the oil, fuel consumed, and new oil
added.
Extending oil and filter change intervals beyond the
recommendations will decrease engine life due to factors
such as corrosion, deposits, and wear.
See the oil drain chart in Section 2 to determine which oil
drain interval to use for your application.
New Engine Break-in Oils
CAUTION
A sulfated ash limit of 1.85 percent has been placed on all engine lubricating oils recommended for use in
Cummins® engines. Higher ash oils can cause valve and/or piston damage and lead to excessive oil
consumption.
CAUTION
The use of a synthetic-base oil does not justify extended oil change intervals. Extended oil change intervals
can decrease engine life due to factors such as corrosion, deposits, and wear.
Special break-in engine lubricating oils are not recommended for new or rebuilt Cummins® engines. Use the same
type of oil during the break-in as is used in normal operation.
Additional information regarding lubricating oil availability throughout the world is available in the EMA Lubricating Oils
Data Book for Heavy-Duty Automotive and Industrial Engines. The data book can be ordered from: Engine
Manufacturers Association, Two North LaSalle Street, Chicago, IL 60602; [phone],
(www.enginemanufacturers.org).