2004 Cadillac CTS-V Owner's Manual - Page 304

What Kind of Engine Oil to Use Look for two things: • 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 do not have the GM4718M Standard designation, you can cause engine damage not covered by your warranty. 5-18