The 2021 Subaru Forester requires 0W-20 synthetic engine oil.
The Forester’s 2.5-liter flat-four engine (the FB25) is designed to run on 0W-20 full-synthetic oil. Using the correct oil helps maintain optimal lubrication, fuel efficiency, and emissions compliance. Oil choices should meet Subaru’s specifications and local market standards, with a focus on quality synthetic formulations.
Oil specifications for the 2021 Forester
Below are the key specifications and guidelines you should follow when selecting oil for the 2021 Forester.
- Oil grade and type: 0W-20 synthetic engine oil (full synthetic).
- Standards: meets API SN (or newer) and ILSAC GF-6 where applicable.
- Engine compatibility: suitable for the 2.5L FORESTER engine (FB25).
- Oil capacity: approximately 4.4–4.8 quarts (with filter), depending on model and market.
- Brand guidance: Subaru Genuine Motor Oil or any high-quality synthetic oil that meets the above grade and standards.
Following these specifications helps ensure proper lubrication, engine longevity, and optimal performance. If you’re outside the US, verify local regional guidance and availability.
Notes on maintenance and inspection
Oil changes should follow Subaru’s maintenance minder system. The interval is influenced by driving conditions, climate, and usage. Always rely on the maintenance minder to determine when to replace the oil and filter, and consult a Subaru dealer if you have questions about oil choices in your region.
Summary
For a 2021 Subaru Forester, use 0W-20 synthetic oil that meets API SN or newer and ILSAC GF-6 standards. The typical oil capacity is about 4.4–4.8 quarts with a filter, and oil changes should be performed according to the maintenance minder guidelines, using Subaru-approved or equivalent high-quality synthetic oil.