Can you use 10W 40 oil in a 1998 Chevy Lumina?

Yes, you can use 10W-40 oil in a 1998 Chevy Lumina, as it falls within the acceptable viscosity range for this vehicle. However, it's important to check the owner's manual for the manufacturer's recommended oil viscosity and specifications. If the engine is high mileage or has significant wear, 10W-40 may provide better protection. Always ensure that the oil meets API service standards suitable for your engine.