2006 Dodge Ram 3500 Pickup Owner Manual Diesel - Page 381

MAINTAINING YOUR VEHICLE 381 • Driving in dusty conditions. • Frequent trailer towing. • 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 ЉMaintenance 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 ЉMaintenance 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 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. 2. Engine Oil Viscosity (SAE Grade) The proper SAE viscosity of engine oil for the expected ambient temperature range should be selected, as indicated in the following chart: 7