The oil filter location and part number for your Subaru Forester
Your Subaru Forester's oil filter sits on the driver's side of the engine, below the intake manifold and behind the front wheel. The filter is a cylindrical canister roughly the size of a soda can, and you reach it from underneath the vehicle or by removing the wheel well liner. The part number depends on your model year: 1998 to 2002 Foresters use Subaru part 16097-AA051, while 2003 to 2008 models use 16097-AA100, and 2009 and newer use 16097-AA160. Always confirm your exact year and engine size (2.0L, 2.5L, or turbocharged) before ordering, because Subaru has made multiple filter designs across generations.
You can buy the correct filter from a Subaru dealership, an auto parts chain like AutoZone or O'Reilly, or online retailers. Dealership filters typically cost $8 to $15, while aftermarket filters from Fram, Bosch, or Mobil run $6 to $12. The filter itself is the same job regardless of brand, so the choice comes down to price and availability. If you are replacing the filter yourself, you will also need a filter wrench (a metal band tool that costs $5 to $10) and a drain pan to catch old oil.
Key Takeaways
- The Subaru Forester oil filter is located on the driver's side of the engine, accessible from underneath or after removing the wheel well liner.
- The correct part number varies by model year: 16097-AA051 for 1998–2002, 16097-AA100 for 2003–2008, and 16097-AA160 for 2009 and newer.
- Dealership filters cost $8 to $15, while aftermarket brands like Fram or Bosch run $6 to $12 and perform the same function.
- You will need a filter wrench and a drain pan if you replace the filter yourself, and the job takes 10 to 15 minutes once you locate the filter.
How to locate the filter under your Forester
The easiest way to find the filter is to get under the vehicle safely. Raise the Forester on a jack or drive it onto ramps, then look toward the driver's side of the engine block. The filter hangs vertically from a threaded bolt. On newer models (2009 and up), the filter is easier to reach because Subaru moved it slightly higher. On older Foresters, you may need to remove the plastic wheel well liner on the driver's side to get clear access without scraping your knuckles.
If you cannot see it from below, consult your owner's manual for your specific year — Subaru's layout changed slightly between generations. Some owners find it faster to remove the driver's side wheel and reach through the wheel well rather than crawling under the whole vehicle. Once you locate it, you will see a metal canister with a bolt on top and a rubber gasket seal where it threads into the engine block.
Steps to remove and replace the filter
Before you start, warm the engine for a minute or two so the oil flows more easily, then turn it off and let it cool for five minutes. Place your drain pan underneath the filter to catch any oil that spills when you unscrew it. Use your filter wrench to grip the canister near the bottom and turn it counterclockwise — it should loosen after a quarter turn, then you can unscrew it by hand the rest of the way.
Once the old filter comes free, inspect the rubber gasket on the threaded bolt to make sure it came off with the filter and did not stick to the engine. If the gasket stayed behind, remove it by hand before installing the new one. Wipe the threaded bolt clean with a rag. Take your new filter and explore a thin coat of fresh oil to the rubber gasket on its top — this helps create a watertight seal and makes removal easier next time. Screw the new filter on by hand until the gasket touches the engine block, then turn it an additional three-quarters of a turn. Do not use the wrench to tighten it; hand-tight is correct.
Start the engine and let it run for 30 seconds, then turn it off and wait two minutes. Check the oil level on the dipstick — it may have dropped slightly because fresh oil filled the new filter. Top off if needed, then you are finished.
When to replace your Forester's oil filter
Subaru recommends replacing the oil filter every time you change the oil. For most Foresters, that means every 6,000 miles if you use conventional oil, or every 10,000 miles if you use synthetic. Some newer models with synthetic oil can go 12,000 miles between changes. Check your owner's manual for your specific year, because Subaru has adjusted these intervals over time.
If you drive in severe conditions — towing, frequent short trips, dusty roads, or extreme heat — Subaru recommends changing the filter more often, sometimes as frequently as every 3,000 miles. The filter traps dirt and debris, so replacing it regularly keeps your engine cleaner and helps it last longer. Skipping filter changes between oil changes is not recommended, because the filter becomes clogged and restricts oil flow.
Choosing between dealership and aftermarket filters
A Subaru dealership filter is manufactured to Subaru's specifications and carries a warranty if something goes wrong. Aftermarket filters from major brands like Fram, Bosch, Mobil, or Purolator meet the same industry standards and work just as well in a Forester. The main differences are price and availability — dealership filters may take a day or two to arrive if the parts department does not stock them, while auto parts stores usually have aftermarket filters in stock.
Some owners prefer dealership filters for peace of mind, while others save money with aftermarket brands. Both will protect your engine if installed correctly. The gasket quality and filter media are similar across brands, so the choice is yours. If you are unsure, ask your mechanic or the parts counter which brand they recommend for your Forester's year and engine size.
Tools and supplies you will need
To replace the filter yourself, gather these items before you start: a new oil filter (the correct part number for your year), a filter wrench, a drain pan, fresh oil (in case the level drops), a rag or paper towels, and a jack or ramps to safely raise the vehicle. A filter wrench is essential — trying to unscrew the filter by hand usually results in a stripped canister or scraped knuckles. You can buy a wrench at any auto parts store for $5 to $10, and it will last for years.
If you do not have a drain pan, a shallow baking pan or old oil container works in a pinch, but a proper drain pan is easier to pour from and less likely to spill. Wear old clothes or an apron, because oil stains are permanent. Work in a well-lit area so you can see the filter clearly and avoid dropping parts into the engine bay.
Frequently Asked Questions
Can I replace the oil filter without changing the oil?
Yes, you can replace the filter alone, though it is not common practice. The filter traps contaminants over time, so replacing it without fresh oil means the new filter is working with old, dirty oil. Most mechanics recommend changing both together, but if you just changed the oil and the filter is due, you can replace the filter separately.
What happens if I install the filter too tight?
Over-tightening the filter can damage the rubber gasket and cause an oil leak. The gasket is designed to seal with hand-tight pressure plus three-quarters of a turn — that is all the force needed. If you use a wrench to tighten it further, you risk cracking the canister or the gasket, which will leak oil onto your engine and driveway.
How do I know which filter wrench size to buy?
Subaru Forester oil filters use a standard size that fits most universal filter wrenches sold at auto parts stores. When you buy the wrench, bring your old filter or the new one with you and test-fit it on the wrench before you leave the store. This takes 30 seconds and ensures you have the right size.
Is it normal for oil to drip after I replace the filter?
A few drops when you first start the engine are normal as the new filter fills with oil. If oil continues to drip or pools under the vehicle after 10 minutes of running, the gasket may not be seated correctly. Turn off the engine, let it cool, and check that the filter is tight enough. If it is, the gasket may be damaged and the filter may need to be replaced again.