2009 Jeep Grand Cherokee Owner Manual SRT8 - Page 354

352 MAINTAINING YOUR VEHICLE Besides the maintenance items for which there are fixed maintenance intervals, there are other items that should operate satisfactorily without periodic maintenance. However, if a malfunction of these items does occur, it could adversely affect the engine or vehicle performance. These items should be inspected if a malfunction is observed or suspected. Engine Oil Checking Oil Level To assure proper engine lubrication, the engine oil must be maintained at the correct level. Check the oil level at regular intervals, such as every fuel stop. The best time to check the engine oil level is about 5 minutes after a fully warmed engine is shut off or before starting the engine after it has sat overnight. Checking the oil while the vehicle is on level ground will improve the accuracy of the oil level readings. Maintain the oil level in the "SAFE" range. Adding one quart of oil when the reading is at the bottom of the "SAFE" range will result in an oil level at the top of the "SAFE" range on these engines. NOTE: Fill engine oil one quart at a time. CAUTION! • Overfilling or underfilling will cause oil aeration or loss of oil pressure. This could damage your engine. • Operating the engine with the oil levels below the safe zone, or operating with oil levels that exceed the top of the safe zone may cause engine damage. Change Engine Oil Refer to the "Maintenance Schedule" in Section 8 for proper maintenance intervals.