D 350 Pickup L6-359 5.9L DSL (1989)
Engine Oil: Description and Operation
OIL PERFORMANCE RECOMMENDATIONS
Use CE/SF or CE/SG grade oil (equivalent to MIL-L45199B) in your Cummins Turbo Diesel Engine.
NOTE: CC/CD or CD/SF oils can be used in areas where CE oil is not yet available.
Dual Category oils provide the performance required of each individual category. For example, a CC/CD oil is blended to meet both CC and CD
performance levels.
A Sulfated Ash limit is specified for lubricating oil used in the Cummins Turbo Diesel Engine. Past experience has shown that oils with a high ash
content may produce deposits on valves that can progress to guttering and valve burning. A maximum sulfated ash content of 1.85 mass % is
recommended for all oil used in the engine.
BREAK-IN OILS
Do not use special "break-in" lubricating oils in the Cummins Turbo Diesel Engine. Use the lubricating oils specified for normal engine operation.
(See Oil Specifications for complete details).
OIL VISCOSITY RECOMMENDATIONS
Use a multi-graded* oil, with the viscosity grades shown above, in the Cummins Turbo Diesel Engine. The use of single grade lubricating oil is
not recommended.
NOTES:
* 20W20 is not considered a multi-grade oil.
** The same oil change interval is to be followed for synthetic oil as for petroleum based oil. Also, synthetic oil must meet the same performance
specifications as petroleum oil. (See Oil Specifications)
ARCTIC OPERATION
Where there are no provisions to keep the engine warm when it is operating in ambient temperatures consistently below -23°C [-10°F), use a
lubricating oil that meets the following requirements:
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SAE 5W30 viscosity grade synthetic oils may be used provided they meet the minimum viscosity at 100°C [212°F].
