2003 Honda Civic Owner's Manual - Page 204
2003 Honda Civic Manual
Page 204 highlights
Engine Oil Adding Oil ENGINE OIL FILL CAP Recommended Oil Oil is a major contributor to your engine's performance and longevity. Always use a premium-grade 5W-20 detergent oil displaying the API Certification Seal. This seal indicates the oil is energy conserving, and that it meets the American Petroleum Institute's latest requirements. Honda Motor Oil is the preferred 5W-20 lubricant for your car. It is highly recommended that you use Honda Motor Oil in your car for optimum engine protection. Make sure the API Certification Seal says ''For Gasoline Engines.'' API CERTIFICATION SEAL To add oil, unscrew and remove the engine oil fill cap on top of the valve cover. Pour in the oil, and install the engine oil fill cap. Tighten it securely. Wait a few minutes and recheck the oil level. Do not fill above the upper mark; you could damage the engine. Pour the oil slowly and carefully so you do not spill. Clean up any spills immediately. Spilled oil could damage components in the engine compartment. CONTINUED Maintenance 203