How much oil does a 2008 Subaru 2.5 take?
Approximately 4.5 quarts of engine oil for a full change with a new filter (about 4.3 liters).
The 2008 Subaru 2.5-liter flat-four engines used across Impreza, Legacy, and Outback share a similar oil capacity. The official specification is around 4.5 quarts with a filter; some service notes list slightly lower amounts when the filter isn’t replaced. Always verify with your owner's manual and check the dipstick after filling.
Oil capacity figures and how they apply
Before you open the hood, here is a quick look at typical capacities and why they can vary. The following list covers the most common figures you’ll encounter when performing an oil change on a 2008 2.5-liter Subaru engine.
- With oil filter replacement: about 4.5 quarts (4.3 liters).
- Without replacing the filter: roughly 4.0–4.2 quarts (3.8–4.0 liters).
- After performing a full drain and refilling to the indication on the dipstick, you may need to top up a small amount (usually less than a quarter to a half quart), depending on exact engine code and oil pan tolerance.
These figures are approximate because variations in oil pan capacity, engine version (EJ251, EJ252, EJ25D), and local service practices can alter the precise fill. Consult the owner's manual or a Subaru service bulletin for your exact vehicle.
Why the numbers vary and how to verify
The 2008 model year used several 2.5-liter variants across Impreza, Legacy, Outback and Forester lines. Differences in oil pan drain plug position, filter size, and whether the drain plug is cleaned during maintenance can cause small discrepancies. The best practice is to begin with 4.5 quarts, run the engine, check for leaks, then top up to the full mark on the dipstick.
Practical steps for an accurate oil change
Follow these steps to ensure you reach the correct oil level and maintain engine health.
- Warm up engine, then shut off and safely lift the vehicle if needed.
- Drain oil completely and replace the oil filter.
- Fill with 4.5 quarts of recommended oil (5W-30 in most climates).
- Start engine, run at idle a few minutes, check for leaks, then shut off and check dipstick; add small amounts as needed until at the full mark.
By adhering to the recommended capacity and using the correct viscosity for your climate, you help ensure optimal engine protection and performance.
Summary
For a 2008 Subaru 2.5-liter engine, plan on about 4.5 quarts of oil for a full change with a new filter, with a typical range of 4.0–4.2 quarts if the filter isn’t replaced. Always confirm with the owner's manual and check the dipstick after filling.
