2007 Jeep Grand Cherokee Owner's Manual - Page 312

312 STARTING AND OPERATING Maintenance If you operate the vehicle using E-85 fuel, follow "Maintenance Schedule B." Refer to Section 8 of this manual. CAUTION! Do not use ethanol mixture greater than 85% in your vehicle. It will cause difficulty in cold starting and may affect driveability. FUEL REQUIREMENTS - DIESEL Diesel fuels are available from most reputable fuel marketers. We encourage you to use only the best quality fuel with a calculated Cetane Index of 50 or higher. In addition, the manufacturer recommends using diesel fuel with a sulfur content of less than 15 ppm. See your authorized dealer or distributor for further information regarding fuels available in your area. In areas where diesel fuel is below the recommended quality levels (high levels of sulfur and water) it is critical to monitor the fuel filter for contamination and the "Water-In-Fuel" message in the EVIC (Refer to Section 4). Failure to properly service the fuel system for these items can significantly reduce engine life and lead to major engine repair. More frequent service intervals of the fuel filter/water separator unit may be required under these conditions than those shown in "Maintenance Schedule A or B." See your authorized dealer or distributor for specific information.