Every 30,000-50,000 miles, or as recommended by severity of use.
Coolant Flush Interval:
Every 30,000 miles or 3 years.
Fluid Specifications
Engine Oil Spec:
SAE 5W-30 (API-certified)
Engine Oil Capacity:
4.0L: 5 quarts (4.7L); 4.7L V8: 6 quarts (5.7L)
Transmission Fluid Type:
ATF+4 (Chrysler Material Standard MS-9602)
Coolant Type:
Mopar OAT (Organic Additive Technology) 50/50 mix (Chrysler Material Standard MS-9769)
Brake Fluid Type:
DOT 3
Power Steering Fluid:
ATF+4 or equivalent
Known Issues
Common Problems Engine:
Cracked cylinder heads on early 4.7L V8 models, intake manifold gasket leaks (4.0L), oil filter adapter housing leaks.
Common Problems Transmission:
Transmission fluid leaks, torque converter issues, overdrive band wear.
Common Problems Suspension Steering:
Worn control arm bushings, ball joints, steering stabilizer, death wobble (severe cases).
Common Problems Electrical:
Window regulator failures, HVAC blower motor resistor failure, ABS sensor failures, PCM (Powertrain Control Module) issues.
Common Problems Body:
Rust on rear quarter panels, tailgate, and rocker panels, especially in areas with road salt.
📚 Vehicle History
Brand Heritage
Jeep Legacy:
Jeep has a long-standing reputation for robust off-road capability and durable utility vehicles since its World War II origins.
Model Evolution
Wj Generation Introduction:
The WJ Grand Cherokee was introduced for the 1999 model year, representing a significant redesign with a more car-like unibody construction and increased interior refinement compared to its predecessor (ZJ).
2004 Model Year Updates:
The 2004 model year represented the final year of the WJ generation. Updates included the availability of the higher-output 4.7L V8 engine and refinements to the Quadra-Drive II system. Minor styling tweaks were also present.
Production
Production Location:
Jefferson North Assembly Plant, Detroit, Michigan, USA.
Production Years Wj:
1999-2004
🏆 Awards & Recognition
Recognitions
Automotive Press Awards:
The Grand Cherokee WJ often received praise for its refined interior, capable powertrains, and its ability to balance on-road comfort with off-road prowess, earning accolades from automotive publications during its run.
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