Subaru Legacy / Outback, BN, BS (EU)

Additional Notes

• Across all engine variants in the Subaru Legacy / Outback BN/BS (EU) range, the brake fluid fill level is specified as between the minimum and maximum marks on the reservoir, rather than as a fixed volume. A min-to-max specification of this kind is standard for hydraulic brake system reservoirs, where the fluid level is checked and topped up rather than measured by a precise capacity figure.
• Under normal use conditions, the brake fluid change interval for the 2.0D is 30,000 km or 24 months, whichever comes first. The dual-trigger format means the time limit applies even when the mileage threshold has not been reached.
• Under severe use conditions, the 2.0D brake fluid change interval is reduced to 15,000 km or 12 months. Severe use conditions represent more demanding operating environments, and the halved interval reflects the accelerated degradation brake fluid can experience under such circumstances.
• The 2.0T variant, covering 2014-2018, shares the same interval structure as the 2.0D: 30,000 km or 24 months under normal use, and 15,000 km or 12 months under severe use.
• The 2.5i appears in two separate specification entries: one covering only 2014, and another covering 2015-2019. Both entries carry identical interval values, with normal use at 30,000 km or 24 months and severe use at 15,000 km or 12 months.
• The 3.6R, spanning 2014-2019, follows the same interval pattern as all other engine variants in the range. The consistency across a six-cylinder engine and the smaller-displacement units indicates the intervals are system-based rather than engine-specific.
• The severe use interval of 15,000 km or 12 months represents exactly half the distance and half the time of the normal use interval across every engine variant listed. Brake fluid is hygroscopic, meaning it absorbs moisture over time, which lowers its boiling point and can compromise braking performance under high-heat conditions associated with severe use.