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Driving in dusty conditions.
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Frequent trailer towing.
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Taxi, police, or delivery service (commercial service).
•
Off-road or desert operation.
•
Extensive operation at high engine speeds (greater
than 2900 rpm) and loads (greater than 70% throttle).
If ANY of these apply to you, then change your engine oil
at every interval shown in schedule ЉBЉ of the ЉMainte-
nance SchedulesЉ section of this manual.
If none of these apply to you, then change your engine oil
at every interval shown on schedule ЉAЉ of the ЉMainte-
nance SchedulesЉ section of this manual.
NOTE: Most vehicles are operated under the conditions
listed for Schedule ЉB.Љ
Engine Oil Selection
1. Engine Oil Quality
Use only oils conforming to API
Service CI-4. A sulfated ash limit
is specified for lubrication oil used
in Cummins engines. Oils with a
high ash content may produce de-
posits 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.
2. Engine Oil Viscosity (SAE Grade)
The proper SAE viscosity of engine oil for the expected
ambient temperature range should be selected, as indi-
cated in the following chart:
MAINTAINING YOUR VEHICLE 327
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