The typical oil capacity for the 2008 CTS is about 5 quarts with the oil filter for the standard 3.6L V6, while the high-performance CTS-V variant requires roughly 7 quarts. Always confirm the exact amount for your specific engine configuration in the owner’s manual or on the under-hood label.
Engine options and oil capacity
The oil capacity depends on which engine your CTS has. The following covers the most common configurations for the 2008 model year.
- 3.6L V6 (most common in 2008 CTS): 5 quarts (4.7 L) of engine oil with a new filter
- CTS-V (high-performance V8): 7 quarts (6.6 L) of engine oil with a new filter
Note: Some markets or early production runs may have slight variations; always double-check the exact specification in the owner's manual or on the under-hood oil capacity sticker. Use the dipstick to confirm the oil level after filling and avoid overfill.
Practical tips for oil changes
When performing an oil change, ensure you use the correct viscosity and quality as recommended by GM for the 2008 CTS, and replace the oil filter along with the oil. If in doubt, consult a service professional.
Summary
For the 2008 Cadillac CTS, expect about 5 quarts of engine oil with filter for the standard 3.6L V6, and about 7 quarts for the CTS-V's V8. Always verify with the owner's manual and use the dipstick to ensure proper levels after changing oil.