Engine oil Subaru Legacy BP EJ25 (2.5) — viscosity and approvals

Which engine oil for Subaru Legacy BP EJ25 (2.5, 2003–2009) — viscosity, specifications, capacity and change interval.

Engine Specifications

Recommended Oil

Change oil when either condition is reached — mileage OR time. Never exceed both limits simultaneously.

Approved Oil Brands

Subaru Genuine 5W-30 / Castrol GTX 5W-30 / Mobil Super 3000

How to Choose Oil for EJ25

1. Viscosity must match specification — using the wrong viscosity grade is not acceptable. Only 5W-30 is approved for EJ25.
2. Check the approval code on the label — the can must show API SL / ILSAC GF-3 compliance. Regular oil with an incorrect approval may damage the engine.
3. Volume — when changing with a new filter, you need 5.9 L. Check the oil level with the dipstick 5 minutes after filling.
4. 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 Legacy BP EJ25?

Viscosity 5W-30, approval API SL / ILSAC GF-3, volume 5.9 L. Recommended brands: Subaru Genuine 5W-30 / Castrol GTX 5W-30 / Mobil Super 3000.

How often to change the oil in Subaru Legacy BP?

Every 7 500 km or 6 months — whichever comes first. With heavy city driving or short trips, every 7,500–10,000 km.

How much oil does the EJ25 take?

5.9 litres with a new filter. Before ordering, double-check — some Legacy BP variants with the same engine code may differ by 0.2–0.5 L.