2009 Chevrolet Corvette Owner's Manual - Page 331

How to Check Lubricant What to Use To add lubricant when the level is low, use Dexron LS Gear Oil 75W-90 (GM Part No. US. 88862624, in Canada 88862625) meeting GM Specification 9986290. To completely refill after draining, see Recommended Fluids and Lubricants on page 6-12. Then fill to the bottom of the filler plug hole with the Synthetic Gear Lubricant. Headlamp Aiming Headlamp aim has been preset at the factory and should need no further adjustment. However, if your vehicle is damaged in a crash, the headlamp aim may be affected. Aim adjustment to the low-beam headlamps may be necessary if oncoming drivers flash their high-beam headlamps at you (for vertical aim). If the headlamps need to be re-aimed, it is recommended that you take the vehicle to your dealer/retailer for service. To get an accurate reading, the vehicle should be on a level surface. If the level is below the bottom of the filler plug hole, you will need to add some lubricant. Add enough lubricant to raise the level to the bottom of the filler plug hole. 5-55