2009 Chevrolet Corvette Owner's Manual - Page 299

When to Add Engine Oil (ZO6 and ZR1) See Engine Compartment Overview on page 5-14 for the location of the external engine oil tank and fill cap. If the oil is below the cross-hatched area at the tip of the dipstick, add at least one quart/liter of the recommended oil through the oil fill cap opening in the oil tank. This section explains what kind of oil to use. For engine oil crankcase capacity, see Capacities and Specifications on page 5-110. See Racing or Other Competitive Driving on page 4-14 for additional information on engine oil. Notice: Do not add too much oil. If the engine has so much oil that the oil level gets above the cross-hatched area that shows the proper operating range, the engine could be damaged. Add enough oil to put the level somewhere in the proper operating range. Push the dipstick all the way back into the oil tank when through. Changing Engine Oil and Filter (ZO6 and ZR1) These vehicles have a racetrack-ready dry sump engine lubrication system. This high-performance system operates differently than a standard engine lubrication system and requires a special procedure when changing the engine oil and filter. Follow this procedure closely when changing the engine oil and filter. 5-23