2003 Chevrolet Corvette Owner's Manual - Page 243

I The engine oil fill cap is located in the engine compartment on top of the valve cover on the passenger's side of the vehicle. See Engine Compartment Ovetvie on w page 5-12 for more information on location. I When to Add Engine Oil If the oil is at or below the cross-hatched area at the tip of the dipstick, you'll need to add at least one quart of oil. But you must use the right kind. This part explains what kind of oil to use. For engine oil crankcase capacity, see Capacities and Specifications on page 5-89. See "Racing or Other Competitive Driving'' under Starting Your Engine on page2-21 for additional information on engine oil. Notices Don't add too much oil. If your engine has so much oil that the oil level gets above the upper mark that shows the proper Operating range, your engine could be damaged. Be sure to fill it enough to put the level somewhere in the proper operating range. Push the dipstick all theway back in when you're through. What Kind of Engine Oil to Use Look for two things: 0 GM4718M Your vehicle's engine requires a special oil meeting GM Standard GM4718M. Oils meeting this standard may be identified as synthetic. However, not all synthetic oils will meet this GM standard. You should look for and use only an oil that meets GM Standard GM4718M. Notice: If you use oils that don't have the GM4718M Standard designation, you can cause engine damage not covered by your warranty. 5-14