4.0 i 4x4 (ZJ) with gasoline 6 cylinder 4.0 L 181 HP engine (1991.9–1999.4)
620–820 rpm620–820 rpm620–820 rpm
5.2 i 4x4 (ZJ) with gasoline 8 cylinder 5.2 L 212 HP engine (1992.9–1999.4)
500–900 rpm500–900 rpm500–900 rpm
5.9 i 4x4 (1997.8–1999.4)
500–900 rpm500–900 rpm500–900 rpm
All other modifications
875–925 rpm875–925 rpm875–925 rpm
Minimum engine oil temperature at VET
158°F158°F70°C
expand_morePetrol exhaust gas values
CO content at idling speed
0.1–0.5 %0.1–0.5 %0.1–0.5 %
Increased idling speed
2500–2800 rpm2500–2800 rpm2500–2800 rpm
Lambda value
0.97–1.03 λ0.97–1.03 λ0.97–1.03 λ
Maximum HC content at idling
100 ppm100 ppm100 ppm
To reduce environment impact and pass government inspections keep emission parameters at the level prescribed by Jeep.
Please be noted that all capacities listed here are approximate. Check fluid levels when adding or refilling as recommended in your 1998 Jeep Grand Cherokee user's manual. Keep in mind that all information here is provided “as is” without any warranty of any kind.
Before doing any DIY service please check your insurance policy and Jeep warranty policy for your region. In some regions DIY service may invalidate your warranty.
DIY car service is not as difficult as it looks like and it might save you thousands of dollars per year. It might be even fun and a good thing to do with your kids on a weekend to teach them how basic machinery works. It's really hard to screw something up and damage your car permanently if you use right tools, follow Jeep Grand Cherokee service manual and use right parts and fluids in prescribed amounts. Even modern cars stuffed with electronics can be serviced in your garage or even in your driveway. Changing engine oil, brake fluid, ATF, replacing brake pads, and etc. It's all may be done by yourself in a mater of a couple of hours.
Doing basic service for your 1998 Jeep Grand Cherokee you're not only saving money, but also also improving your technical skills and learning something new.
1998 Jeep Grand Cherokee generations
In 1998 Jeep offered 2 generations of the Grand Cherokee. Emission may vary in different generations. Be sure that you are looking at the rigt modification.