The 2008 Toyota 4Runner with the 4.0-liter V6 uses 5W-30 engine oil, API SN or newer, and ILSAC GF-5 or newer. You can use conventional or synthetic oil, and the engine oil capacity is about 6.6 quarts with a filter.
Recommended oil type and viscosity
Toyota's specifications for the 1GR-FE 4.0L V6 in the 2008 4Runner call for a 5W-30 viscosity to provide protection across typical driving conditions. While a synthetic oil is acceptable, Toyota does not require it; conventional 5W-30 is suitable as long as it meets API SN (or newer) and ILSAC GF-5 (or newer) standards. For extreme temperatures, 5W-30 remains appropriate; 0W-30 or 10W-30 are not generally recommended unless Toyota specifies otherwise for a particular climate or driving regime.
What you need to know before you buy:
- Viscosity: 5W-30 is the standard recommendation for the 2008 4Runner's 4.0L V6 in most climates.
- Oil type and standards: Use either conventional or synthetic oil that meets API SN (or newer) and ILSAC GF-5 (or newer) specifications.
- Oil capacity: Approximately 6.6 quarts (about 6.2–7 quarts depending on drain plug and filter changes).
- Change interval: Follow Toyota's recommended interval, typically around 5,000 miles under normal conditions, with more frequent changes under severe driving conditions.
- Compatibility: If you’re switching brands or adding a high-mileage formula, ensure it still meets the above API/ILSAC standards.
Conclusion: The simplest guidance is to use a 5W-30 oil that meets API SN or newer and ILSAC GF-5 or newer, in roughly 6.6 quarts, and to change it at the interval suggested by Toyota for your driving conditions.
Summary
Bottom line: Use 5W-30 engine oil (synthetic or conventional) that meets API SN or newer and ILSAC GF-5 or newer, about 6.6 quarts, with an oil-change interval around 5,000 miles under normal driving. Always verify exact specifications in your owner's manual or with a Toyota dealer for your specific vehicle and climate.