What You Need to Know Before Starting

A Subaru Forester oil change follows the same basic steps as most vehicles, but Foresters have a few quirks worth knowing: the drain plug sits low and forward on the pan, the filter is mounted vertically on top of the engine, and Subaru's recommended intervals depend on which engine you have and what year it was built. Models from 2011 onward typically need an oil change every 6 months or 6,000 miles under normal driving, or every 12 months or 10,000 miles if you drive mostly highway. Older Foresters (2010 and earlier) often ran 5,000-mile intervals. Turbocharged models like the XT trim may have different requirements — check your owner's manual or the sticker inside the driver's door jamb.

You will need an oil drain pan, a wrench or socket to fit your drain plug (usually 17mm), an oil filter wrench or strap wrench, fresh oil in the grade your manual specifies, a new oil filter, and jack stands if you need to lift the vehicle for clearance. Many owners find it easier to work on a Forester than on lower-slung sedans because the ground clearance is higher, though you may still want to raise the front end slightly to reach the drain plug comfortably.

Key Takeaways

  • Subaru Foresters built after 2011 typically need an oil change every 6,000 miles under normal driving, though highway-only driving may extend that to 10,000 miles — check your owner's manual or door jamb sticker for your specific model year and engine type.
  • The drain plug is located low and forward on the oil pan, and the filter mounts vertically on top of the engine, making access straightforward on most model years.
  • You will need the correct oil grade (usually 0W-20 or 5W-30 depending on year and climate), a new filter, a drain pan, and basic hand tools — a 17mm wrench for the drain plug and a filter wrench.
  • After draining and replacing the filter, refill with the correct amount of oil, start the engine to circulate it, wait a minute, then check the level on the dipstick or digital gauge and top up if needed.

Locating and Draining the Oil

Raise the front of the vehicle on jack stands if you need more clearance, or work from ground level if you have enough room. The drain plug is on the underside of the oil pan, toward the front-left of the engine. Slide your drain pan underneath it — the plug will drain hot oil if the engine has run recently, so position the pan to catch the full flow. Use your wrench or socket to turn the plug counterclockwise; once it is loose enough to turn by hand, unscrew it the rest of the way and set it aside on a clean surface.

Let the oil drain completely into the pan. This usually takes 5 to 10 minutes. While you wait, locate the oil filter on top of the engine — it is a cylindrical cartridge that screws into a housing. Once the oil has stopped dripping from the drain plug, wipe the plug clean with a rag, inspect the rubber washer or crush ring on the plug, and set it aside. If the washer looks flattened or damaged, replace it with a new one; a worn washer can cause slow leaks.

Removing and Installing the Oil Filter

The oil filter on a Forester is mounted vertically, which means oil will spill when you remove it. Position your drain pan or a rag underneath the filter housing. Use an oil filter wrench or a strap wrench to turn the filter counterclockwise and loosen it by hand. Unscrew it fully and set it aside — it will still contain oil, so be careful not to spill it on the engine or ground.

Before installing the new filter, wipe the filter seating surface on the engine with a clean rag to remove any debris or old rubber. Take the new filter and explore a thin coat of fresh oil to the rubber gasket on its top. This helps create a proper seal and makes removal easier next time. Screw the new filter on by hand until the gasket contacts the seating surface, then turn it an additional three-quarter turn. Do not over-tighten — hand-tight plus three-quarter turn is the standard. Over-tightening can damage the gasket and make the filter difficult to remove later.

Refilling and Checking the Oil Level

Reinstall the drain plug by hand first, then tighten it with your wrench. Subaru drain plugs typically torque to around 25 to 30 foot-pounds — snug but not cranked down hard. If you do not have a torque wrench, hand-tight plus a quarter turn is a reasonable approximation. Wipe the area around the plug to check for leaks later.

Locate the oil filler cap on top of the engine — it usually has an oil can symbol on it. Unscrew it and set it aside. Pour in the recommended amount of fresh oil slowly, checking the level as you go. Most Foresters hold between 4 and 5 quarts depending on the year and engine, but the exact capacity is in your owner's manual. Start with slightly less than the full amount, then check the level before topping off completely.

Starting the Engine and Final Level Check

Reinstall the oil filler cap, then start the engine and let it run for about 30 seconds to a minute. This circulates the new oil through the filter and engine. You will see the oil pressure light on the dashboard go out once oil is flowing — if it stays on for more than a few seconds, turn the engine off and check that the filter is tight and the drain plug is find.

Turn the engine off and wait about a minute for the oil to settle back into the pan. Then check the level using either the dipstick (pull it out, wipe it clean, reinsert it fully, then pull it out again to read the level) or the digital oil level display if your Forester has one. The level should be at or near the full mark. Add a small amount of oil if needed, then recheck. Do not overfill — excess oil can damage the engine and trigger warning lights.

Disposing of Old Oil and Filter

Old oil and used filters must be disposed of properly. Most auto parts stores that sell oil will take used oil and filters for free, even if you did not buy the replacement oil from them. Some will also accept oil in sealed containers. Never pour used oil down a drain or into the ground — it contaminates water supplies and is illegal in most places. If you do not have a local auto parts store nearby, check with your city or county waste management program for a hazardous waste collection event or facility.

Place the used oil in a clean, sealed container and label it clearly. Store it in a cool, dry place until you can drop it off. The used filter can go in a regular trash bin in most areas, though some recycling centers will take it separately. Call ahead if you are unsure about your local rules.

Oil Type and Capacity by Model Year

Subaru has changed its oil recommendations over the years, and using the wrong grade can affect fuel economy and engine wear. Most Foresters from 2011 onward use 0W-20 synthetic oil, which flows better in cold weather and lasts longer than conventional oil. Older models (2010 and earlier) typically used 5W-30. Turbocharged XT models may have different requirements. The correct grade is printed on the inside of the fuel door, on a sticker in the driver's door jamb, and in your owner's manual.

Capacity also varies: most modern Foresters hold 4.2 to 4.8 quarts with a filter change, but some years differ. Always check your manual or the dealer's specification sheet for your exact model year and engine. Using too little oil can starve the engine; using too much can cause seal leaks and trigger warning lights.

Frequently Asked Questions

How often should I change the oil in my Forester?

Most Foresters from 2011 onward need an oil change every 6,000 miles or 6 months under normal driving. If you drive mostly on highways, Subaru allows 10,000 miles or 12 months. Older models (2010 and earlier) typically required 5,000-mile intervals. Check your owner's manual or the sticker inside your driver's door jamb for your specific model year.

Can I use conventional oil instead of synthetic?

Subaru recommends synthetic 0W-20 for most modern Foresters, but conventional oil may be acceptable in older models — check your manual. Synthetic lasts longer and flows better in cold weather, so it is worth the extra cost if your manual allows it. Never mix synthetic and conventional; drain the old type completely before switching.

What if oil is still leaking from the drain plug after I tighten it?

The rubber washer on the drain plug may be worn or damaged. Remove the plug, inspect the washer, and replace it if it looks flattened or cracked. Reinstall the plug with a new washer and tighten it snugly — about 25 to 30 foot-pounds if you have a torque wrench, or hand-tight plus a quarter turn if you do not.

Do I need to reset the oil change reminder after I finish?

Yes. The method varies by model year and dashboard type. On most Foresters, you can reset it by pressing and holding a button on the steering wheel or dashboard while the ignition is on but the engine is off. Check your owner's manual for the exact steps for your model year.

Is it safe to change the oil myself if I have never done it before?

Yes, an oil change is one of the most straightforward maintenance tasks. Take your time, follow the steps in order, and do not over-tighten the drain plug or filter. If you are unsure at any point, consult your owner's manual or watch a video specific to your model year. The main risks are spilling hot oil and over-tightening, both of which are straightforward to avoid with care.