2005 Dodge Ram 2500 Pickup Owner Manual Diesel - Page 344

344 MAINTAINING YOUR VEHICLE Never operate the engine with oil level below the "ADD" mark or above the upper "SAFE" mark. Change Engine Oil • Extensive engine idling (over 10 minutes per hour of operation) at ambient temperatures less than 32° F (0° C). • 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. CAUTION! Overfilling or underfilling the crankcase will cause oil aeration or loss of oil pressure. This could damage your engine. Road conditions as well as your kind of driving affect the interval at which your oil should be changed. Check the following to determine if any apply to you: • Frequent short trips where the engine does not achieve full operating temperature (operating temperature defined as 190° F (66° C) coolant temperature).