What type of engine oil does a 1991 Nissan 240sx take?

A 1991 Nissan 240SX typically requires 10W-30 or 10W-40 engine oil. It's important to use oil that meets the API (American Petroleum Institute) service classification of at least SF or higher. Always check the owner's manual for specific recommendations and consider the climate conditions where you drive. Regular oil changes will help maintain engine performance and longevity.