Engine oil Subaru Outback BS FB25 (2.5 boxer) — viscosity and approvals
Which engine oil for Subaru Outback BS FB25 (2.5 boxer, 2014–2019) — viscosity, specifications, capacity and change interval.
Engine Specifications
| Parameter | Value |
|---|---|
| Marca / Modello | Subaru Outback BS |
| Codice motore | FB25 |
| Displacement / Fuel | 2.5 boxer petrol |
| Anni di produzione | 2014–2019 |
Recommended Oil
| Parameter | Value |
|---|---|
| Viscosity | 5W-30 |
| Specification / Approval | ILSAC GF-5 / Subaru Extra S-class |
| Fill volume | 5.9 L (including oil filter) |
| Change interval (mileage) | 10 000 km |
| Change interval (time) | 12 months |
Change oil when either condition is reached — mileage OR time. Never exceed both limits simultaneously.
Approved Oil Brands
Subaru Genuine Extra S 5W-30 / Castrol GTX 5W-30 / Mobil Super 3000 5W-30
How to Choose Oil for FB25
- Viscosity must match specification — using the wrong viscosity grade is not acceptable. Only 5W-30 is approved for FB25.
- Check the approval code on the label — the can must show ILSAC GF-5 / Subaru Extra S-class compliance. Regular oil with an incorrect approval may damage the engine.
- Volume — when changing with a new filter, you need 5.9 L. Check the oil level with the dipstick 5 minutes after filling.
- Do not mix grades — if topping up, use the same viscosity and specification.
Consequences of Using the Wrong Oil
- Oil with a wrong approval for a petrol engine can clog the DPF filter (diesel) or cause excessive oil consumption.
- Too thin oil (e.g. 10W-40 instead of 5W-30) accelerates timing chain/belt and crankshaft bearing wear.
- Too thick oil makes cold starting difficult and increases fuel consumption.
Domande frequenti
What oil goes in a Subaru Outback BS FB25?
Viscosity 5W-30, approval ILSAC GF-5 / Subaru Extra S-class, volume 5.9 L. Recommended brands: Subaru Genuine Extra S 5W-30 / Castrol GTX 5W-30 / Mobil Super 3000 5W-30.
How often to change the oil in Subaru Outback BS?
Every 10 000 km or 12 months — whichever comes first. With heavy city driving or short trips, every 7,500–10,000 km.
How much oil does the FB25 take?
5.9 litres with a new filter. Before ordering, double-check — some Outback BS variants with the same engine code may differ by 0.2–0.5 L.
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