Jeep 2004 Grand Cherokee - Manual (Page 231)

NOTE: If you tow a trailer frequently, especially in hilly
country or when the outdoor temperature is high, we
recommend that you change the transmission fluid at
30,000 mile (48 000 km) intervals.
CAUTION!
When pulling a heavy load or driving a fully loaded
vehicle use a premium unleaded fuel to help prevent
spark knock. If spark knock persists, lighten the
load. Otherwise, engine piston damage may result.
Other restrictions apply concerning trailer type, trailer
frontal area and tongue weight. Carefully review the
“Minimum Vehicle Requirements” chart in this section
before towing a trailer.
RECREATIONAL TOWING (BEHIND
MOTORHOME, ETC.)
CAUTION!
Internal damage to the transfer case will occur if a
front or rear wheel lift is used when recreational
towing.
NOTE: The transfer case must be in the N (Neutral)
position, and the transmission must be in the P (Park)
position for recreational towing. (Recreational towing is
not available on Quadra-Trac I equipped vehicles.)
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