What kind of transmission fluid does a 2008 Subaru Legacy take?
The 2008 Subaru Legacy uses different fluids depending on the transmission type. If your car has the four-speed automatic (4EAT), it requires Dexron III–compatible automatic transmission fluid. If it has a five-speed manual transmission, it uses a 75W-90 GL-5 gear oil. Always confirm the exact specification in your owner's manual or with a Subaru dealer for your specific vehicle.
Automatic transmission (4EAT)
The automatic 4EAT in the 2008 Legacy is typically filled with Dexron III–type ATF. Use an ATF that meets Dexron III (or an equivalent Mercon/Dexron-compatible specification) as recommended by Subaru for this era.
- Dexron III–compatible automatic transmission fluid (ATF) is the standard specification for the 4EAT in most 2008 Legacy models.
- Use a reputable brand that meets the Dexron III/Mercon specification; avoid fluids that do not indicate compatibility with Dexron III unless your manual specifically permits otherwise.
In practice, many owners use Dexron III–compliant ATF from major brands, which is compatible with the 4EAT as long as it states Dexron III on the label.
Manual transmission (5-speed)
The manual transmission in the 2008 Legacy calls for gear oil rather than ATF. Use a 75W-90 gear oil that meets GL-5 specifications. If your car has a limited-slip differential, verify the correct friction modifiers with Subaru.
- 75W-90 GL-5 gear oil is the standard specification for the 5-speed manual transmission.
- For models with a limited-slip differential, ensure the oil is compatible with LSD and follow Subaru's guidance for that configuration.
For most manual-equipped models, a high-quality 75W-90 GL-5 gear oil from a reputable brand is appropriate.
Summary
In short, a 2008 Subaru Legacy uses Dexron III–compatible ATF for automatic transmissions and 75W-90 GL-5 gear oil for manual transmissions. Always verify your exact configuration in the owner's manual or with a Subaru dealership, and follow the official maintenance schedule to ensure proper shifting and longevity.
