Parts for your 2017 Subaru Forester-Engine oil

2017 Subaru Forester engine oil — what it does and when to change it

Engine oil is absolutely used and essential on the 2017 Subaru Forester. Technical sources including the 2017 Forester Owner’s Manual, Subaru Australia/New Zealand Service & Warranty Handbook, and Subaru Technical Information specify engine oil for both available engines: the 2.5‑litre FB25 and the 2.0‑litre turbo FA20F. These documents outline the correct grades, capacities, and service intervals, and require a full‑synthetic oil meeting current API/ILSAC standards.

What’s the point of engine oil in a Forester? It keeps everything spinning smoothly under the bonnet by reducing friction, carrying away heat, suspending contaminants, protecting against rust and varnish, and helping the rings seal against the cylinder walls. Without fresh, correct‑spec oil, wear goes up, temperatures climb, and performance and reliability can take a hit.

Recommended grades are model‑dependent: most 2.5i models run 0W‑20 full‑synthetic, while the 2.0XT turbo typically requires 5W‑30 full‑synthetic. The oil should meet API SN or later (SP is fine) and ILSAC GF‑5 or GF‑6. Approximate refill volumes with a new filter are about 4.8 litres (2.5i) and about 5.1 litres (2.0XT). Always confirm the engine variant and local spec sheet in the handbook.

For Australia and New Zealand conditions, Subaru schedules oil and filter replacement at roughly every 12 months or 12,500 km, whichever comes first. If the Forester sees a lot of short trips, dusty roads, towing, hot weather, or spirited driving (especially on the turbo XT), it’s smart to shorten the interval. Fresh oil is cheap insurance for timing chains, turbo bearings, and overall longevity.

• Check the dipstick monthly and top up with the same viscosity and spec.
• Replace the filter with every oil change and use a new sump plug washer.
• Only mix oils if stuck, matching viscosity/spec is key, then do a proper change soon.
• Dispose of used oil responsibly at a recycling point.

A workshop that knows Subarus will also look for leaks at the sump, filter, and rocker covers, inspect for oil consumption trends, and reset the service reminder. Keep records in the service book to protect warranty and resale value.

Popular questions about 2017 Subaru Forester engine oil

What oil grade does a 2017 Subaru Forester use?
Most 2.5i (FB25) models specify 0W‑20 full‑synthetic. The 2.0XT turbo (FA20F) typically specifies 5W‑30 full‑synthetic. Use oil that meets API SN or newer (SP is fine) and ILSAC GF‑5/GF‑6. Check the owner’s manual for your exact variant and climate.

How often should the oil be changed in Australia or New Zealand?
Under normal use, plan for every 12 months or 12,500 km, whichever comes first, with the filter replaced each time. If the car does lots of short trips, towing, dusty work, or hot‑weather driving, bring that forward.

How much oil does it take?
Approximate refill volumes with a new filter are about 4.8 litres for the 2.5i and about 5.1 litres for the 2.0XT. Always check the dipstick after filling and top up to the upper mark without overfilling.