Engine Oil

ENGINE OIL QUALITY

Use only oil's 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 deposits on valves that can progress guttering and valve burning. A maximum sulfated ash content of 1.85 mass % is recommended for all oil used in the engine.

Engine Oil Viscosity

Above 0°F (-18°C) 15W-40

Above -20°F (-29°C) 5W-40 Synthetic

The proper SAE viscosity of engine oil for the expected ambient temperature range should be selected, as indicated in the in the chart.

NOTE: The same oil change interval is to be followed for synthetic oil must meet the same petroleum based oil. Also, synthetic oil must meet the same performance specifications as petroleum oil.

You may use synthetic engine oils provided the recommended oil quality requirements are met, and the recommended maintenance intervals for oil and filter changes are followed.

MATERIALS ADDED TO ENGINE OIL
The manufacture strongly recommends against the addition of any additives (other than leak detection dyes or lube odorants) to the engine oil. Engine oil is an engineered product and it's performance may be impaired by supplemental additives.

NOTE: The manufacturer offers a lube odorant (Mopar Diesel Fresh) for diesel engines crankcases. The lube odorant is recommended by the manufacturer to reduce the sulfur smell that may occur during engine idling.