2009 Jeep Grand Cherokee Owner's Manual - Page 461

MAINTAINING YOUR VEHICLE 459 Component Fuel Selection (3.7L and 4.7L Engine) Fuel Selection (5.7L Engine) Fuel Selection (3.0L Diesel Engine) Fluid, Lubricant, or Genuine Part 87 Octane 87 Octane Acceptable - 89 Octane Recommended Use good quality diesel fuel from a reputable supplier in your vehicle. The manufacturer requires that you must fuel this vehicle with Ultra Low Sulfur Highway Diesel fuel (15 ppm Sulfur maximum) and prohibits the use of Low Sulfur Highway Diesel fuel (500 ppm Sulfur maximum) to avoid damage to the emissions control system. For most year-round service, No. 2 diesel fuel meeting ASTM specification D-975 Grade S15 will provide good performance. If the vehicle is exposed to extreme cold (below 20F or -7C), or is required to operate at colder-than-normal conditions for prolonged periods, use climatized No. 2 diesel fuel or dilute the No. 2 diesel fuel with 50% No. 1 diesel fuel. This will provide better protection from fuel gelling or wax-plugging of the fuel filters. This vehicle is fully compatible with biodiesel blends up to 5% biodiesel meeting ASTM specification D-975. 7