The 2017 Subaru Legacy uses different oil capacities depending on the engine: about 4.6 quarts (roughly 4.4 liters) for the 2.5-liter four-cylinder, and about 6.9 quarts (roughly 6.5 liters) for the 3.6-liter flat-six, including a new oil filter.
The 2017 Legacy was offered with two engines, and oil capacity varies by model. Below are the standard capacities for a full oil change with a new filter, along with notes on oil type and follow-up steps.
Engine options and oil capacities
These figures reflect a complete oil change with a new filter and standard draining procedures.
- 2.5L flat-four (FB25): 4.6 quarts (approximately 4.4 liters) with filter
- 3.6L flat-six (H6): 6.9 quarts (approximately 6.5 liters) with filter
These figures are typical for a standard oil change, but exact capacity can vary slightly by market and production batch. Always verify the precise specification for your vehicle in the owner's manual or with a Subaru dealer.
Oil type and other notes
Guidance on oil grade and related reminders:
- Recommended viscosity: 0W-20 synthetic oil for both engines (check the owner's manual; some markets may have alternatives)
- The capacity numbers above include the oil needed to fill after replacing the filter; if you are topping up, add only enough oil to reach the full mark
- Always replace the oil filter at each change and use a genuine Subaru filter or an equivalent high-quality substitute
After pouring, start the engine and check for leaks, then recheck the dipstick to confirm the oil level is within the proper range. Regular oil changes should follow the maintenance schedule in your manual.
Why capacities differ between engines
The 2.5L and 3.6L engines have different oil pan sizes and filter configurations, which accounts for the difference in overall capacity. This is why the four-cylinder requires roughly 4.6 quarts, while the six-cylinder needs about 6.9 quarts for a complete change.
Summary
In brief, the 2017 Subaru Legacy’s oil capacity depends on the engine: about 4.6 quarts (roughly 4.4 liters) for the 2.5L engine and about 6.9 quarts (roughly 6.5 liters) for the 3.6L engine, typically using 0W-20 synthetic oil. Always consult the owner's manual for your specific trim and regional requirements, replace the filter during the change, and verify the level with the dipstick after filling.