Grand Cherokee SRT-8 V8-6.1L (2009)
Engine Oil: Fluid Type Specifications
Engine Oil ...................................................................................................................................................................... Mobil 1 SAE 0W-40 or equivalent.
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 DaimlerChrysler Material Standard MS-10725.
The manufacturer recommends the use of a full synthetic engine oil.
