A 1998 Jeep Wrangler's recommended oil depends on the engine it has. There were several engine options available that year. You must check your owner's manual to determine the correct oil type and viscosity.
The owner's manual will specify the weight (e.g., 5W-30, 10W-40) and type (conventional, synthetic blend, or full synthetic) of oil recommended for your specific engine. Using the incorrect oil can damage your engine.
