A 1998 Chevrolet Lumina's oil requirements depend on the engine it has. There were several engine options available that year. To know for sure, you need to check your owner's manual. It will specify the correct type (conventional, synthetic blend, or full synthetic) and viscosity (e.g., 5W-30, 10W-30).
However, a common recommendation for many 98 Lumina engines was 5W-30. But again, check your owner's manual for the definitive answer. The wrong oil can damage your engine.
