Do subarus need full synthetic oil?
Yes, for most modern Subarus, full synthetic oil is recommended or required. The exact viscosity depends on the engine and climate, so always check the owner's manual for your model year.
What Subaru manuals typically require
Oil type and viscosity are engine-specific; Subaru's current practice leans toward full synthetic oil, especially for newer engines. The most common specification is 0W-20 synthetic oil for many models; some engines or climates tolerate 5W-30 synthetic. Synthetic blends may be permitted in certain situations if explicitly approved in the owner's manual. Reliability and warranty considerations push toward synthetic oil in modern Subarus.
- 0W-20 full synthetic is by far the most common specification for many 2010s-2020s Subarus.
- 5W-30 synthetic is specified or approved for some engines, climates, or older models in certain regions.
- Synthetic blends are sometimes allowed if the manual explicitly permits them; conventional oil is generally discouraged for newer engine designs.
In practice, follow the exact specification listed in your owner's manual instead of relying on a general rule.
Oil change intervals (OCI) and driving conditions
Oil change intervals vary by oil type and driving conditions. The industry trend and Subaru's guidance aim to extend intervals when synthetic oil is used, but severe service shortens them.
- With synthetic oil, many Subarus target 7,500–10,000 miles (12,000–16,000 km) between changes under normal driving, or as shown by the Oil Life Monitor.
- With conventional oil or in severe service (towing, frequent short trips, extreme temperatures), intervals of 3,000–5,000 miles (4,800–8,000 km) or less may apply.
Always follow the maintenance schedule in the owner's manual and heed the Oil Life Monitor if your model includes it.
Turbocharged versus naturally aspirated engines
Subaru's turbocharged engines, including WRX and some models with the FA or EJ families, run hotter and under higher pressures, which generally calls for higher-grade oil and strict adherence to viscosity specs.
- Turbocharged/Subaru performance engines typically require full synthetic oil, commonly 5W-30, though some climates or models may specify 0W-20 synthetic.
- Non-turbo or lower-output engines also benefit from full synthetic, but the required viscosity will be specified in the manual; always match the recommended grade.
Turbs demand consistent lubrication to protect bearings and turbo seals, so sticking to the official spec is especially important for these engines.
Practical guidance for Subaru owners
To ensure you choose the right oil for your Subaru, keep these steps in mind.
- Always consult the owner's manual for the exact oil type and viscosity required by your engine and climate.
- Prefer full synthetic oil, or a high-quality synthetic blend that meets API SN or GF-6 specs, as specified.
- Use a reputable brand and ensure the oil and filter change are performed correctly, with proper torque on the drain plug and filter.
Sticking to Subaru's specifications supports engine longevity, efficiency, and warranty coverage.
Summary
Subarus generally require or strongly benefit from full synthetic oil, with the exact viscosity dictated by engine type and climate. For many late-model Subarus, 0W-20 synthetic is the default recommendation, while 5W-30 synthetic is used in others or in warmer conditions. OCI depends on oil type and driving conditions, but synthetic oils typically allow longer intervals when guided by the Oil Life Monitor. Always follow the owner's manual and seek professional advice if you're unsure.
When did Subaru start using synthetic oil?
In the last 10 plus years there have been a number of internal changes in clearances in a Subaru Motor. The 2.2 and 2.5 motor from the mid 90's required a synthetic blend oil such as Castrol or Kendal which is the oil we use at Suburb Service.
Can you put regular oil in a Subaru?
Most Subaru models can use either conventional or synthetic motor oil. Conventional oil is less expensive but needs to be changed more often, typically every 3,000-5,000 miles.
Does Subaru recommend synthetic oil?
What Type of Oil Should I Put in My Subaru? Most new Subaru vehicles require synthetic oil with a viscosity rating of 0W-20. However, the correct Subaru oil type varies depending on the model year, so always consult your owner's manual for the most accurate information.
Is it okay to put regular oil instead of synthetic?
Yes, you can use conventional oil instead of synthetic, as modern oils are compatible and switching between them will not harm your engine. However, it's important to ensure the new conventional oil has the correct viscosity and API/ILSAC ratings for your vehicle, and switching to conventional might mean you need to change the oil more frequently.
Why it's safe to switch
- Compatibility: Modern synthetic and conventional oils are designed to be compatible and can be mixed without needing an engine flush, even if you've used only synthetic before.
- No damage: Switching will not damage your engine. Some old myths suggested this was a risk, but it's no longer an issue with today's formulations.
What to consider
- Vehicle requirements: Check your owner's manual to confirm the recommended viscosity (e.g., 5W-30) and performance standards (API/ILSAC). Some high-performance or turbocharged engines may specifically require synthetic oil, so it's best to follow the manufacturer's recommendation.
- Maintenance frequency: Conventional oil breaks down faster than synthetic, especially in extreme temperatures, and may require more frequent oil changes.
- Engine condition: If you've used synthetic oil for a long time, especially in an older engine, switching to conventional might cause a temporary, minor leak. This can happen because synthetic oil is thinner and has additives that clean deposits, which can sometimes dislodge grime from old seals. This usually resolves itself over time.
