In brief, the 2008 Hyundai Sonata requires different oils depending on the engine: 5W-20 for the 2.4-liter four-cylinder and 5W-30 for the 3.3-liter V6. Both grades should meet API SN or higher and ILSAC GF-4 or higher, and synthetic or synthetic-blend oil is recommended where possible.
Engine options and oil requirements
The 2008 Sonata was offered with two gasoline engines, each with its own oil recommendation. Below are the key specifics for each engine variant.
2.4L inline-four
The 2.4L engine typically specifies a viscosity of 5W-20. Use a synthetic or synthetic-blend oil that meets API SN or higher and ILSAC GF-4 (or higher). The approximate oil capacity with filter change is about 4.2–4.5 quarts, depending on market and configuration.
3.3L V6
The 3.3L V6 commonly requires 5W-30 viscosity. Choose a synthetic or synthetic-blend oil that meets API SN or higher and ILSAC GF-4 (or higher). The approximate oil capacity with filter change is around 5.0 quarts, with minor variation by model year and market.
Note: Always verify the exact specification and capacity for your vehicle in the owner’s manual or with a Hyundai dealer, since production changes or regional differences can occur.
Practical guidance
To ensure you’re using the correct oil for day-to-day maintenance, follow the official guidance for your engine variant and climate. The following points summarize practical considerations.
- Confirm engine type (2.4L vs 3.3L) to determine the correct viscosity: 5W-20 for the 2.4L and 5W-30 for the 3.3L.
- Use oil that meets API SN or higher and ILSAC GF-4 or higher; synthetic or synthetic-blend oils are preferred for longevity and better cold-start performance.
- Keep within the approximate capacities listed above when changing oil and replacing the filter, but always check the manual for exact figures.
For the most accurate guidance, consult the 2008 Sonata’s owner's manual or contact a Hyundai service representative. Regional specs can differ, and a professional can confirm the correct oil grade for your VIN.
Summary
The 2008 Hyundai Sonata uses 5W-20 oil for the 2.4-liter inline-four and 5W-30 oil for the 3.3-liter V6, with both oils ideally meeting API SN or higher and ILSAC GF-4 or higher. Synthetic or synthetic-blend formulations are recommended, and oil capacity varies by engine — roughly 4.2–4.5 quarts for the 2.4L and about 5.0 quarts for the 3.3L. Always verify exact requirements in the owner's manual or with a Hyundai dealer.