Nissan Forester 2.5 Oil Capacity & Filter Size Guide

If you're searching for Nissan Forester 2.5 oil capacity quarts and filter size, you're likely preparing for an oil change and want the exact numbers before you drain anything. Getting the oil capacity wrong means either underfilling (which risks engine wear) or overfilling (which can cause foaming and seal damage). The right filter size matters just as much a wrong filter can leak, fit poorly, or fail to trap contaminants properly. Here's what you need to know.

One quick note: the Forester is manufactured by Subaru, not Nissan. Many people search "Nissan Forester" by mistake, possibly mixing it up with the Nissan Rogue or similar compact SUVs. The specs below apply to the Subaru Forester 2.5-liter naturally aspirated (non-turbo) engine, which uses the EJ25 or FB25 engine depending on the model year.

How Many Quarts of Oil Does a Subaru Forester 2.5 Take?

The oil capacity varies slightly depending on the generation and whether you're changing the filter at the same time. With a filter change (which you should always do), here are the numbers by generation:

1998–2002 Forester 2.5 (EJ25): approximately 4.2 quarts (4.0 liters) with filter
2003–2008 Forester 2.5 (EJ25): approximately 4.2–4.5 quarts (4.0–4.3 liters) with filter
2009–2013 Forester 2.5 (EJ25): approximately 4.4 quarts (4.2 liters) with filter
2014–2018 Forester 2.5 (FB25): approximately 4.4–4.8 quarts (4.2–4.5 liters) with filter
2019–2024 Forester 2.5 (FB25): approximately 4.8 quarts (4.5 liters) with filter

Always check your owner's manual for the exact figure for your specific year. The numbers above are based on manufacturer specifications and real-world oil change experiences. If you're also curious about the turbo XT models, the capacity is slightly different you can read more about the 2005 Forester turbo XT oil requirements in our separate breakdown.

What Oil Filter Size Fits the Forester 2.5?

The filter type depends on your engine generation:

Spin-On Filters (Older EJ25 Engines)

Foresters from roughly 1998–2013 with the EJ25 engine use a traditional spin-on oil filter. The most common OEM filter is the Subaru 15208AA12A (the blue Subaru filter). It has a thread size of 3/4-16 UNF and a gasket outer diameter of about 2.75 inches.

Compatible cross-reference filters include:

Fram PH3506
Wix 57055
Purolator L14612
Napa 1356
Bosch 3323

Cartridge-Type Filters (Newer FB25 Engines)

Starting around 2011–2014 and later, Subaru transitioned the FB25 engine to a cartridge-style oil filter housed inside a plastic cap. The OEM part is typically Subaru 15208AA150 or 15208AA170. This is a completely different design you reuse the housing cap and replace only the internal cartridge element.

If you're not sure which filter style your Forester uses, look under the engine. A metal canister spinning off the engine block means spin-on. A plastic cap on top of the engine (accessible from above in many cases) means cartridge.

For a more detailed cross-reference matching your exact model year, check our Forester oil type and filter cross-reference guide.

What Type of Oil Should I Use in the Forester 2.5?

Subaru generally recommends:

EJ25 engines (1998–2013): 5W-30 conventional or synthetic
FB25 engines (2011+): 0W-20 full synthetic

Using the wrong viscosity like putting 5W-30 in an FB25 that calls for 0W-20 can reduce fuel economy and increase internal wear over time. The tighter tolerances in the newer engine design require the thinner oil.

For a complete list of compatible viscosities and filter options by year, see our full Forester 2.5 oil capacity and filter selection page.

What Are the Most Common Oil Change Mistakes?

These are the errors we see most often with Forester 2.5 oil changes:

Not replacing the drain plug crush washer. Subaru uses an aluminum crush washer on the drain plug. Reusing it can lead to a slow leak. They cost under a dollar replace it every time.
Overfilling. The difference between "low" and "full" on the dipstick is roughly 0.6 quarts. Add oil slowly and check the dipstick before adding the last half-quart.
Using the wrong filter. On cartridge-type engines, people sometimes buy a spin-on filter or vice versa. Always verify your engine code (EJ25 vs. FB25) before purchasing.
Forgetting to pre-fill the filter. On spin-on filters, pouring a small amount of fresh oil into the filter before installation helps prevent a dry start. Also wipe a thin film of oil on the gasket.
Not resetting the oil change light. On newer Foresters, hold the trip reset button with the ignition on until the indicator resets.

How Often Should You Change the Oil?

Subaru's recommended interval for most Forester 2.5 models is 6,000 miles or 6 months, whichever comes first, when using the specified synthetic oil. If you drive in severe conditions frequent short trips, dusty roads, extreme heat or cold, or towing consider shortening that to 3,000–5,000 miles.

Many Forester owners report that the FB25 engine can consume a small amount of oil between changes (around 1 quart per 3,000 miles is not unusual). Check your dipstick regularly, especially on high-mileage engines.

Quick Checklist for Your Next Forester 2.5 Oil Change

Confirm your engine code: EJ25 (older) or FB25 (newer)
Buy the correct oil: 5W-30 for EJ25, 0W-20 for FB25
Purchase the right filter: spin-on (EJ25) or cartridge (FB25)
Have enough oil: 4.2–4.8 quarts depending on your model year
Replace the drain plug crush washer
Fill to the correct level on the dipstick don't just dump the full jug in
Reset the oil change indicator on the dash
Run the engine for a minute, shut off, wait 5 minutes, and re-check the level

Keep a small notebook or use a phone app to log the date, mileage, oil brand, filter part number, and capacity used each time. It helps you track consumption patterns and makes future changes faster.