The recommended oil grade for a 1998 Jeep Cherokee 4.0L depends on the climate where you live. Your owner's manual is the definitive source, but generally, a
5W-30 is a common and often recommended grade for this engine. However, in very cold climates, a
0W-30 might be preferable, while in very hot climates, a
10W-30 could be considered.
Always check your owner's manual for the specific recommendations for your vehicle and your geographic location. The manual will likely specify the oil viscosity grades and the API service classification (e.g., SM, SN, etc.)
