The 2008 Cadillac CTS generally uses 5W-30 motor oil, with synthetic or synthetic-blend options recommended. Oils should meet GM’s 6094M specification, and you should verify the exact requirement for your engine and climate in the owner's manual.
Oil requirements for the 2008 CTS
The 2008 CTS offered two V6 engines—the 3.6-liter and a smaller 3.2-liter option—both typically calling for 5W-30 oil. While Dexos1 certification became common later, oils that meet GM’s older 6094M specification are appropriate for these cars. Oil capacity varies by engine and setup, and climate can influence the best choice of viscosity. Always consult the owner’s manual or a Cadillac service advisor for the VIN-specific specification.
Oil specifications in a quick reference
These bullet points summarize the core requirements you’re likely to encounter when selecting oil for a 2008 CTS.
- Viscosity: 5W-30 is the standard recommendation for most climates on the 2008 CTS.
- Specification: Use oil that meets GM’s 6094M specification; oils labeled Dexos1 are compatible with these engines.
- Oil type: Synthetic or synthetic-blend oils are preferred for protection and longevity; conventional oil is possible but not ideal for this model year.
- Capacity: Expect roughly 5 to 6 quarts of oil with a filter, depending on the engine; verify the exact capacity in the manual.
In practice, this means a high-quality 5W-30 oil that meets GM 6094M—ideally synthetic or synthetic-blend—will service a 2008 CTS well. Always confirm the precise requirement for your engine variant and local climate with official documentation.
Additional considerations
For extreme temperatures or if you drive aggressively, some owners opt for variations within the 5W-30 family or consult their dealer for climate-specific guidance. Regular oil changes using the correct specification remain essential for an aging engine like the CTS.
Summary: For a 2008 Cadillac CTS, choose a 5W-30 motor oil that meets GM 6094M, with synthetic or synthetic-blend formulations preferred. Verify exact viscosity and capacity in your owner's manual or with a Cadillac service professional for your engine variant and climate. Regular maintenance will help sustain performance and longevity.