2009 Dodge Challenger Owner Manual SRT8 - Page 345

MAINTAINING YOUR VEHICLE 343 The best time to check the engine oil level is about five 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 1.0 qt (1.0 L) 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: Under no circumstances should oil change intervals exceed 6,000 miles (10 000 km) or six months, whichever occurs first. Engine Oil Selection For best performance and maximum protection under all types of operating conditions, the manufacturer only recommends full synthetic engine oils that meet the American Petroleum Institute (API) categories of SM or SM/CF, and meet the requirements of Chrysler Material Standard MS-10725. The manufacturer recommends the use of a full synthetic engine oil, such as Mobil 1௡ SAE 0W-40 or equivalent. Engine Oil Viscosity (SAE Grade) SAE 0W-40 engine oil is preferred for use in 6.1L engines within the operating temperatures shown in the engine oil viscosity chart. SAE 5W-40 engine oil is also allowed for use in 6.1L engines. The proper SAE viscosity grade of engine oil should be selected based on the following CAUTION! Overfilling or underfilling will cause oil aeration or loss of oil pressure. This could damage your engine. Change Engine Oil Refer to the "Maintenance Schedule" in Section 8 for the proper maintenance intervals. 7