What oil does a 2021 Subaru Outback (2.5L FB25 (4-cyl boxer)) take?
Subaru Outback · US market
We have a provisional entry for the 2021 Subaru Outback (2.5L FB25 (4-cyl boxer)), but it is not yet verified against the owner's manual. Treat the values below as a starting point only and confirm in your manual before buying oil.
- Recommended viscosity
- 0W-20
- Required specification
- Use Subaru-approved oil; if unavailable, the manual lists API SN or SN PLUS Resource Conserving, or ILSAC GF-5 (printed pp. 532–533).
- Oil capacity
- 4.4 quarts (with filter)
- Officially allowed alternatives
- 5W-30 — Only for topping up when 0W-20 synthetic oil is unavailable. (Conventional oil; return to 0W-20 synthetic at the next oil change. Printed p. 533 / PDF p. 539; not a general oil-change substitute.)
- Normal service interval
- 6,000 miles / 9,600 km / 6 months / Oil and filter: whichever occurs first. 2021 US Federal/California schedule, printed/PDF p. 28, items 1–2.
- Severe-service interval
- 3,000 miles / 4,800 km / 3 months / For oil/filter items 1–2 under the booklet’s applicable examples: repeated short trips, extremely cold operation, or repeated trailer towing. Printed/PDF p. 29, note 1 and examples a/d/g. Do not apply unrelated component conditions to oil service.
Evidence status for this row
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Missing primary evidence, unresolved conflicts or pending review keeps the row provisional and noindex.
Source: Subaru 2021 Legacy/Outback Owner’s Manual, MSA5M2104B; FB25 2.5L, US; corroborated by Subaru of America 2021 Outback Getting Started Guide. Verification status: Provisional. How we source data · Find the manual
Oil-change kit checklist
2021 Subaru Outback oil-change kit
Data status: Provisional. Use this as a prep list only; the owner's manual wins.
Required
- Owner's manual page for the exact engine and US market
- 0W-20 oil, only if the manual confirms this grade
- Use Subaru-approved oil; if unavailable, the manual lists API SN or SN PLUS Resource Conserving, or ILSAC GF-5 (printed pp. 532–533). specification or approval on the bottle label
- 4.4 qt oil capacity with filter, confirmed before filling
- Oil filter part number, confirmed before buying
Recommended
- New drain plug washer or gasket when the manual/service procedure calls for it
- Drain pan, funnel, gloves, rags, and safe used-oil container
- Torque specification for the drain plug if you are doing the work yourself
- Receipt, mileage, date, and oil label/spec photo for your records
Optional
- Oil filter wrench that fits your exact filter location
- Shop towels or absorbent mat
- Reminder entry for the next interval
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Data correction
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