Jeep 2007 Liberty Owner's Manual page 321

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)
MAINTAINING YOUR VEHICLE 321
• 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 "Mainte-
nance 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 "Main-
tenance Schedules" section of this manual
NOTE: Under no circumstances should oil change in-
tervals exceed 6,000 miles (10 000 km) or 6 months
whichever comes first.
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