The 2018 Subaru Legacy uses two possible engines, with oil capacities that vary by engine: 4.2 quarts for the 2.5-liter four-cylinder and about 5.5 quarts for the 3.6-liter engine.
Engine options in the 2018 Legacy
In 2018, Subaru primarily offered the efficient 2.5-liter FB25 engine for the Legacy, with a larger 3.6-liter EZ36 option available on certain trims or markets. Oil capacity depends on the engine installed.
The following section lists the official oil capacities by engine for the 2018 Legacy.
- 2.5-liter FB25 engine: 4.2 quarts (with oil filter)
- 3.6-liter EZ36 engine: about 5.5 quarts (with oil filter)
These figures cover typical fill quantities used during an oil change; always verify the exact amount using the dipstick after filling and consult the owner's manual for your specific VIN and market region.
Summary
For most 2018 Subaru Legacy owners, expect about 4.2 quarts of engine oil for the 2.5L version, and roughly 5.5 quarts for the 3.6L version. Use the dipstick to confirm the proper level after topping up, and consult the owner's manual for your exact configuration.