What Type of Oil Does a Subaru Forester Take

Choosing the correct oil for your Subaru Forester is essential for engine performance, fuel efficiency, and longevity. This guide breaks down the recommended oil types, viscosity grades, and maintenance schedules tailored to different model years and driving conditions.

Key Takeaways

• Use Synthetic Oil: Subaru recommends full synthetic oil for most Forester models, especially those with turbocharged engines or driven in extreme temperatures.
• Viscosity Matters: The most common recommendation is 0W-20, but some older models may use 5W-30—always check your owner’s manual.
• Follow OEM Specifications: Look for oils that meet Subaru’s SSW-1 or SSW-2 specifications to ensure compatibility and warranty compliance.
• Change Intervals Vary: Standard changes are every 6,000–8,000 miles, but severe driving conditions may require more frequent changes.
• Avoid Conventional Oil: Unless specified for very old models, conventional oil doesn’t meet the performance demands of modern Forester engines.
• Use Subaru Genuine Oil When Possible: While not mandatory, Subaru’s own branded oil is formulated specifically for their boxer engines.
• Check Oil Level Regularly: Forester engines are prone to oil consumption—monitor levels between changes to prevent damage.

What Type of Oil Does a Subaru Forester Take?

If you own a Subaru Forester, you already know it’s more than just a reliable SUV—it’s a trusty companion for road trips, mountain adventures, and daily commutes. But like any high-performing vehicle, it needs the right kind of care to keep running smoothly. One of the most critical aspects of that care? Using the correct engine oil.

Engine oil does more than just lubricate moving parts. It reduces friction, prevents overheating, cleans internal components, and helps maintain fuel efficiency. For a vehicle like the Subaru Forester—with its unique horizontally opposed (boxer) engine design—using the wrong oil can lead to increased wear, poor performance, and even costly repairs down the line.

So, what type of oil does a Subaru Forester take? The short answer: it depends on the model year, engine type, and driving conditions. But don’t worry—we’re going to walk you through everything you need to know, from viscosity grades to synthetic vs. conventional oils, and even how often you should be changing it. By the end of this guide, you’ll be confident in choosing the best oil for your Forester and keeping it in peak condition for years to come.

Understanding Subaru Forester Engine Oil Basics

Before diving into specific recommendations, it’s important to understand why oil choice matters so much for your Forester. Unlike traditional inline or V-shaped engines, Subaru’s boxer engine has pistons that move horizontally, which creates unique lubrication challenges. This design means oil must flow efficiently across a wider surface area and under varying gravitational forces—especially during sharp turns or steep inclines.

Because of this, Subaru engines are more sensitive to oil quality and viscosity. Using the wrong oil can lead to inadequate lubrication, increased oil consumption, and even engine knocking or premature wear. That’s why Subaru provides specific oil guidelines for each model and engine configuration.

Why Oil Viscosity Is Critical

Viscosity refers to how thick or thin the oil is. It’s usually expressed as a two-number code like 0W-20 or 5W-30. The first number (with the “W”) indicates cold-weather performance—how well the oil flows when the engine is cold. The second number shows how the oil behaves at operating temperature.

For most modern Subaru Foresters (2014 and newer), the manufacturer recommends 0W-20 synthetic oil. This thin viscosity allows for quick cold starts, reduces engine drag, and improves fuel economy. In colder climates, 0W-20 flows easily even in sub-zero temperatures, ensuring your engine gets lubricated the moment you turn the key.

However, older models—especially those from the early 2000s—may call for 5W-30 oil. This slightly thicker oil was standard when engine tolerances were less precise and synthetic oils weren’t as advanced. If you’re driving a 2008 or earlier Forester, always double-check your owner’s manual or the oil cap for the correct specification.

Synthetic vs. Conventional Oil: What’s the Difference?

You’ve probably heard the terms “synthetic” and “conventional” oil thrown around, but what’s the real difference?

Conventional oil is refined from crude oil and contains more impurities and inconsistent molecular structures. It breaks down faster under high heat and stress, requiring more frequent changes.

Synthetic oil, on the other hand, is engineered in a lab to have uniform molecules and enhanced additives. It resists thermal breakdown, flows better in cold weather, and provides superior protection against sludge and deposits.

Subaru strongly recommends synthetic oil for all Forester models from 2010 onward. Even if your owner’s manual says “synthetic or conventional,” using full synthetic is the smarter choice. It extends engine life, improves performance, and is especially beneficial for turbocharged engines like those found in the Forester XT models.

Subaru’s Official Oil Specifications

Subaru doesn’t just recommend any oil—they have their own performance standards. Look for oils that meet Subaru’s SSW-1 (Subaru Service Warranty 1) or SSW-2 specifications. These standards ensure the oil has the right additives, viscosity stability, and protection for boxer engines.

Using oil that meets these specs is especially important if you’re still under warranty. While you don’t have to use Subaru-branded oil, using a non-compliant product could void your warranty if an engine issue arises.

Most major oil brands—like Mobil 1, Castrol, Pennzoil, and Valvoline—offer Subaru-approved oils. Just check the label for “Meets Subaru SSW-1” or similar wording.

Recommended Oil Types by Forester Model Year

Now that you understand the basics, let’s break it down by model year. Subaru has made several engine updates over the years, and oil recommendations have evolved accordingly.

2000–2008 Subaru Forester (2.5L Naturally Aspirated or Turbo)

These older Foresters typically use a 2.5-liter flat-four engine. For naturally aspirated versions (non-turbo), Subaru often recommended 5W-30 conventional or synthetic oil. However, if you’re driving a turbocharged model (like the Forester XT), synthetic 5W-30 is strongly advised due to the higher operating temperatures.

Even though conventional oil was acceptable back then, we recommend upgrading to full synthetic if possible. It offers better protection and longer intervals, especially if you drive in stop-and-go traffic or extreme weather.

2009–2013 Subaru Forester (2.5L or 2.0L Turbo)

Starting in 2009, Subaru began shifting toward synthetic oil recommendations. The 2.5L naturally aspirated engine typically calls for 5W-30 synthetic, while the 2.0L turbocharged engine (in the XT trim) requires 5W-30 or 0W-20 synthetic, depending on the exact model and region.

Always refer to your owner’s manual, but if you’re unsure, 5W-30 full synthetic is a safe bet for these years. Just avoid conventional oil unless you’re on a tight budget and doing frequent changes.

2014–2024 Subaru Forester (2.5L or 2.0L Turbo)

This is where things get consistent. Nearly all Foresters from 2014 onward—whether naturally aspirated or turbocharged—use 0W-20 full synthetic oil. This includes the popular FB25 engine and the FA20 turbo in the XT models.

The switch to 0W-20 was made to improve fuel efficiency and meet stricter emissions standards. It’s also better for cold starts, which is great if you live in a snowy or cold climate.

One thing to note: some 2022–2024 Foresters with the 2.5L engine may have a slight oil consumption issue—Subaru acknowledges this and recommends checking oil levels every 1,000 miles. Using high-quality 0W-20 synthetic oil helps minimize this.

Hybrid and Future Models

The 2023–2024 Subaru Forester Hybrid also uses 0W-20 synthetic oil. The hybrid system doesn’t change the oil requirement, but it does mean the engine runs less frequently, which can lead to moisture buildup. Regular oil changes are even more important to prevent sludge and corrosion.

How Often Should You Change the Oil in a Subaru Forester?

Oil change intervals depend on several factors: driving habits, climate, and oil type. Subaru provides general guidelines, but real-world conditions often require adjustments.

Standard Oil Change Interval

For most modern Foresters (2014+), Subaru recommends changing the oil every 6,000 to 8,000 miles or 6 months, whichever comes first—when using full synthetic oil. This is based on “normal” driving conditions, which include highway driving, moderate temperatures, and regular maintenance.

If you follow this schedule and use high-quality synthetic oil, your engine should stay in excellent condition.

Severe Driving Conditions: When to Change More Often

But what if your driving isn’t “normal”? Subaru defines severe conditions as:

– Frequent short trips (less than 10 miles, especially in cold weather)
– Stop-and-go traffic or idling for long periods
– Driving in extreme heat or cold
– Towing a trailer or carrying heavy loads
– Driving on dusty or muddy roads

In these cases, Subaru recommends changing the oil every 3,000 to 5,000 miles. This is especially true if you live in a hot climate or frequently drive in city traffic.

For example, if you commute 5 miles to work in winter, let your car idle for 10 minutes, and drive back—that’s a short trip that doesn’t allow the engine to fully warm up. Moisture and fuel dilution can build up in the oil, reducing its effectiveness.

Using Oil Life Monitors

Many newer Foresters come with an oil life monitoring system that calculates when you need a change based on driving behavior, engine load, and temperature. While this is convenient, it’s not foolproof.

We recommend treating the monitor as a guideline, not a rule. If you drive in severe conditions, don’t wait for the light to come on—change the oil early. Conversely, if you mostly drive on highways in mild weather, you might safely stretch to 8,000 miles.

DIY vs. Professional Oil Changes

You can absolutely change your Forester’s oil yourself if you’re comfortable with basic maintenance. You’ll need:

– 4.8 quarts of 0W-20 full synthetic oil (for most models)
– A new oil filter (Subaru part #15208AA15A or equivalent)
– An oil filter wrench
– A socket set and drain pan
– A funnel

Always dispose of used oil responsibly—most auto parts stores accept it for recycling.

If you prefer professional service, Subaru dealerships and trusted mechanics can do the job quickly. Just make sure they use Subaru-approved oil and filters to maintain your warranty.

Top Recommended Oils for the Subaru Forester

With so many brands on the market, it’s hard to know which oil is best. Here are our top picks based on performance, availability, and Subaru compatibility.

Subaru Genuine Synthetic Oil 0W-20

This is the oil Subaru engineers designed specifically for their engines. It meets SSW-2 specifications and is formulated to reduce wear, prevent sludge, and minimize oil consumption. It’s available at Subaru dealerships and is a great choice if you want peace of mind.

Mobil 1 Advanced Fuel Economy 0W-20

A top-rated full synthetic oil that’s widely available and trusted by mechanics. It offers excellent cold-flow properties, thermal stability, and engine cleanliness. It’s also approved for Subaru use and often more affordable than OEM oil.

Castrol EDGE 0W-20

Known for its titanium additive technology, Castrol EDGE provides superior protection under high stress. It’s ideal for turbocharged Foresters or those who drive aggressively. It meets Subaru SSW-1 specs and is a favorite among performance drivers.

Pennzoil Platinum 0W-20

Made from natural gas (not crude oil), Pennzoil Platinum is ultra-pure and highly resistant to sludge. It’s a great eco-friendly option that still delivers top-tier performance. It’s also approved for Subaru vehicles.

Valvoline Full Synthetic 0W-20

A budget-friendly option that doesn’t sacrifice quality. Valvoline meets Subaru specifications and offers solid protection for daily drivers. It’s widely available at auto stores and Walmart.

What to Avoid

Avoid conventional oils, high-mileage oils (unless your Forester has over 75,000 miles and shows signs of leaks), and oils that don’t meet Subaru’s SSW-1 or SSW-2 standards. Also, steer clear of “energy-conserving” oils with high levels of friction modifiers—they can cause premature wear in boxer engines.

Common Mistakes to Avoid When Choosing Oil

Even experienced drivers make oil mistakes. Here are some common pitfalls and how to avoid them.

Using the Wrong Viscosity

Putting 5W-30 in a 2020 Forester designed for 0W-20 can increase fuel consumption and reduce engine efficiency. Conversely, using 0W-20 in an older model that calls for 5W-30 might not provide enough protection at high temperatures.

Always check your owner’s manual or the oil cap for the correct grade.

Ignoring Oil Consumption

Some Forester models—especially 2014–2018 2.5L engines—are known to consume oil between changes. Subaru acknowledges this and recommends checking the dipstick every 1,000 miles.

If you notice the level dropping quickly, top it off with the same oil you used. Don’t mix different brands or types unless it’s an emergency.

Skipping the Oil Filter

Always replace the oil filter with every change. A dirty filter restricts oil flow and reduces engine protection. Use a high-quality filter like Subaru OEM or WIX, Mann, or Fram Ultra.

Overfilling or Underfilling

Too much oil can cause foaming, which reduces lubrication. Too little oil leads to increased wear. Most Foresters take about 4.8 quarts with a filter change. Always check the dipstick after adding oil.

Using Old or Contaminated Oil

Don’t store opened oil containers for long periods—moisture and air can degrade it. Use fresh oil for every change, and keep containers sealed when not in use.

Conclusion: Keep Your Forester Running Strong

Choosing the right oil for your Subaru Forester isn’t just about following a rule—it’s about protecting your investment and ensuring your vehicle performs at its best. From the early 2000s models to the latest hybrids, using the correct oil type, viscosity, and change interval makes a real difference in engine health, fuel economy, and longevity.

Stick with full synthetic oil, prefer 0W-20 for newer models, and always follow Subaru’s specifications. Check your oil regularly, especially if you drive in severe conditions, and don’t skip the filter. Whether you do it yourself or visit a trusted mechanic, proper oil maintenance is one of the simplest ways to keep your Forester reliable for years to come.

Your Subaru was built for adventure—don’t let the wrong oil hold it back.

Frequently Asked Questions

Can I use 5W-30 instead of 0W-20 in my Subaru Forester?

It’s not recommended. 0W-20 is designed for modern Forester engines to improve fuel efficiency and cold-start performance. Using 5W-30 can increase engine drag and reduce fuel economy, especially in newer models.

Is it okay to mix synthetic and conventional oil in my Forester?

While it won’t immediately damage your engine, it’s best to avoid mixing. Conventional oil dilutes the performance benefits of synthetic. If you must top off, use the same type of oil you originally used.

How much oil does a Subaru Forester hold?

Most Subaru Foresters take approximately 4.8 quarts of oil when changing both the oil and filter. Always check your owner’s manual for your specific model year and engine type.

Can I extend oil changes beyond 8,000 miles?

Only if you drive under ideal conditions and use high-quality synthetic oil. However, Subaru recommends sticking to 6,000–8,000 miles. Extending beyond that increases the risk of sludge and engine wear.

What happens if I use the wrong oil in my Forester?

Using the wrong viscosity or type of oil can lead to poor lubrication, increased wear, reduced fuel economy, and potential engine damage. In extreme cases, it could void your warranty.

Does Subaru sell its own motor oil?

Yes, Subaru offers genuine synthetic motor oil (0W-20) at dealerships. It’s formulated specifically for Subaru engines and meets SSW-2 specifications, making it a reliable choice for Forester owners.