2004 Jeep Liberty Owner's Manual - Page 292

292 MAINTAINING YOUR VEHICLE CAUTION! Overfilling or underfilling the crankcase will cause aeration or loss of oil pressure. This could damage your engine. Change Engine Oil Road conditions as well as your kind of driving affect the interval at which your oil should be changed. Check the following to determine if any apply to you: • Day or night temperatures are below 32°F (0°C) • Stop and go driving • Extensive engine idling • Driving in dusty conditions • Short trip driving of less than 10 miles (16.2 km) • More than 50% of your driving is at sustained high speeds during hot weather, above 90°F (32°C) • Taxi, Police, or delivery service (commercial service) • Trailer towing • Off-road or desert driving If ANY of these apply to you, then change your engine oil at every interval shown in schedule "B" of the "Maintenance Schedules" section of this manual. If none of these apply to you, then change your engine oil at every interval shown on schedule "A" of the "Maintenance Schedules" section of this manual NOTE: Under no circumstances should oil change intervals exceed 6,000 miles (10 000 km) or 6 months whichever comes first.