Checked oil specs by engine
2018 Subaru Legacy oil capacity, type & filter
The 2018 Subaru Legacy takes 5.1 qt of 0W-20 (2.5L 4-Cyl) and 6.9 qt of 5W-30 (3.6L 6-Cyl). Select your engine below before buying.
| Engine | Capacity | Oil Type | Filter |
|---|---|---|---|
| 2.5L 4-Cyl | 5.1 qt | 0W-20 | AMSOIL EA15K13 |
| 3.6L 6-Cyl | 6.9 qt | 5W-30 | AMSOIL EA15K20 |
Match one of 2 checked engine options before buying oil or a filter.
AMSOIL EA15K13 is copied into the checkout checklist below. Other listed filters are source-backed alternatives.
AMSOIL EA15K20 is copied into the checkout checklist below. Other listed filters are source-backed alternatives.
Search paths only — confirm your OEM viscosity spec and quantity before checkout.
Search paths only — confirm your OEM viscosity spec and quantity before checkout.
2018 Subaru Legacy oil specs: capacity conditions and filter notes
Check the door jamb sticker, owner's manual, or displacement badge on the engine cover. Match it to the engine options listed above before buying oil or a filter.
All listed filter part numbers are compatible alternatives for your vehicle. Choose any one brand, then confirm the exact part number at checkout.
With filter means the volume includes a new filter. Service fill is the typical drain-and-fill amount. Dry fill is for a fresh empty engine only.
Retailer fitment tools may use different data. Confirm oil capacity, viscosity, and filter part number before ordering.
Source coverage for the 2018 Subaru Legacy
Supported by Pennzoil OATS, AMSOIL Lookup, and Castrol (Olyslager).
Supported by Pennzoil OATS, AMSOIL Lookup, and Castrol (Olyslager).
Supported by RockAuto, Purolator Part Finder, and AMSOIL Lookup.
5 checked source rows for the 2018 Subaru Legacy.
Before ordering for this 2018 Subaru Legacy
- Capacity
- 5.1 qt (Service fill)
- Oil type
- 0W-20
- Interval
- 6,000 mi / 6 mo
- Filter
- AMSOIL EA15K13
- Capacity
- 6.9 qt
- Oil type
- 5W-30
- Filter
- AMSOIL EA15K20
Source check: Last checked 2026-06-24 from AMSOIL Lookup, Pennzoil OATS, Purolator Part Finder, RockAuto, and Castrol (Olyslager).
Subaru Legacy oil specs by year
This table includes checked Subaru Legacy model years available in our database.
| Year | Capacity | Oil type | Filter |
|---|---|---|---|
| 2025 | 4.8 qt (multiple engines) | 0W-20 | AMSOIL EA15K13 |
| 2024 | 4.8 qt (multiple engines) | 0W-20 | Purolator L14615 |
| 2023 | 4.8 qt (multiple engines) | 0W-20 | PRO-TEC PXL57055 |
| 2022 | 4.8 qt (multiple engines) | 0W-20 | PRO-TEC PXL57055 |
| 2021 | 4.8 qt (multiple engines) | 0W-20 | AMSOIL EA15K13 |
| 2020 | 4.8 qt (multiple engines) | 0W-20 | AMSOIL EA15K13 |
| 2019 | 5.1 qt (multiple engines) | 0W-20 | AMSOIL EA15K13 |
| 2018 Current page | 5.1 qt (multiple engines) | 0W-20 | AMSOIL EA15K13 |
| 2017 | 5.1 qt (multiple engines) | 0W-20 | CHAMP / LUBER-FINER PH2867 |
| 2016 | 5.1 qt (multiple engines) | 0W-20 | Purolator L14615 |
| 2015 | 5.1 qt (multiple engines) | 0W-20 | AMSOIL EA15K13 |
| 2014 | 4.5 qt (multiple engines) | 0W-20 | AMSOIL EA15K13 |
| 2013 | 5.1 qt (multiple engines) | 0W-20 | AMSOIL EA15K13 |
| 2012 | 4.5 qt (multiple engines) | 5W-30 | AMSOIL EA15K12 |
| 2011 | 4.5 qt (multiple engines) | 5W-30 | AMSOIL EA15K12 |
| 2010 | 4.5 qt (multiple engines) | 5W-30 | AMSOIL EA15K12 |
| 2009 | 4.2 qt (multiple engines) | 30 | AMSOIL EA15K12 |
| 2008 | 4.4 qt (multiple engines) | 5W-30 | AMSOIL EA15K12 |
| 2007 | 4.4 qt (multiple engines) | 10W-30 | AMSOIL EA15K12 |
| 2005 | 4.2 qt (multiple engines) | 5W-30 | AMSOIL EA15K12 |
How we verified 2018 Subaru Legacy oil data
How we verify fitmentChecked fitment data. Last checked: 2026-06-24.
This page checked 5 sources for the 2018 Subaru Legacy. The table lists which checked source contributed capacity, oil type, or filter evidence.
We checked leading oil brands and aftermarket filter catalogs so you don't have to.
- Confidence
- Verified fit
- Sources checked
- 5
- Last checked
- 2026-06-24
- Capacity: Pennzoil OATS, AMSOIL Lookup, and Castrol (Olyslager)
- Oil type: Pennzoil OATS, AMSOIL Lookup, and Castrol (Olyslager)
- Filter: RockAuto, Purolator Part Finder, and AMSOIL Lookup
- Change interval: Pennzoil OATS, AMSOIL Lookup, and Castrol (Olyslager)
| Source | Supports | Checked | Link |
|---|---|---|---|
| AMSOIL Lookup | Capacity, Oil type, Filter | 2026-06-24 | Visit brand site |
| Pennzoil OATS | Capacity, Oil type | 2026-06-24 | Visit brand site |
| Purolator Part Finder | Filter | 2026-06-24 | Visit brand site |
| RockAuto | Filter | 2026-06-24 | Checked source |
| Castrol (Olyslager) | Capacity, Oil type | 2026-06-24 | Visit brand site |
2018 Subaru Legacy maintenance checklist
One part checked. Look up the rest while you're here.
Where to buy
These are retailer search paths for your vehicle's oil and filter specs. Verify final fitment at checkout.
This section may include affiliate or sponsored retailer links. They are purchase paths, not fitment evidence.
Walmart
Compare oil and filter listings for the 2018 Subaru Legacy. Confirm capacity, viscosity, and filter part number before checkout.
Search 2018 Subaru Legacy oil & filter →AutoZone
Use AutoZone's vehicle selector for the 2018 Subaru Legacy before checkout to confirm oil capacity, viscosity, and filter fitment.
Search 2018 Subaru Legacy oil & filter →Amazon
Search Amazon listings for the 2018 Subaru Legacy and check listing fitment notes against the specs above.
Search 2018 Subaru Legacy oil & filter →O'Reilly
Open O'Reilly's fitment search for the 2018 Subaru Legacy and verify oil capacity, viscosity, and filter part number before ordering.
Search 2018 Subaru Legacy oil & filter →Look up another vehicle
Find checked oil capacity, type, and filter data by exact year, make, and model.