2005–2009 Subaru Legacy
By Tom Becker ✓ Certified Mechanic · Published Sep 24, 2026 · Updated Oct 19, 2026
Save $126 by doing it yourself! Shop cost: $174
Quick answer: Oil and Filter Change on a 2005–2009 Subaru Legacy is rated Easy and takes about 30–60 minutes. You'll need 7 tools for this job, and parts cost about $48. This guide walks you through the full job step by step, including the mistakes to avoid.
| Part Name | Part Number | Price | Buy |
|---|---|---|---|
| 5W-30 engine oil (about 4.2 to 4.5 quarts) | — | $30.00 | |
| Spin-on engine oil filter (EJ25 bottom-mount application) | — | $16.00 | |
| Oil drain plug crush washer | — | $2.00 |
About prices: shown prices are typical retail averages and change frequently; cheaper alternatives may be available. Confirm the current price before buying.
💡 Pro tip: Order all parts at once to save on shipping
Follow these steps carefully
Idle the engine for 2 to 3 minutes so the oil warms and drains faster, then shut it off. Park on level pavement, set the parking brake, and chock the rear wheels. Warm, not hot, oil is the safe target.
Drive onto ramps or raise the front and support it on jack stands at the reinforced pinch welds. Turn the tabs with a flathead screwdriver and swing the door open.
Slide the drain pan under the oil pan, positioning it slightly rearward because the oil initially shoots out at an angle. Break the drain plug loose with a socket wrench and finish by hand so it does not fall into the pan. Let the oil drain for several minutes until it slows to drips. The pan is drained when the flow becomes an occasional drip.
Wipe the drain plug and the pan surface clean, then fit a new crush washer on the plug. Thread the plug in by hand to protect the aluminum pan threads, then snug it firmly with the wrench without over-tightening.
Reach through the access door and loosen the spin-on oil filter on the underside of the EJ25 with an oil filter wrench, turning counterclockwise. The filter on this Legacy sits close to the exhaust manifold, so it may be hot; wear gloves. Keep the drain pan underneath because the filter holds oil that will spill out. Confirm the old rubber gasket came off with the filter and peel it off the block if it stuck. The mount is clean when no gasket or sludge remains.
Smear fresh engine oil on the new filter's rubber gasket with your fingertip to help it seal and remove cleanly next time. Never use the filter wrench for installation; over-tightening crushes the gasket.
Quick word from someone who's been under there: I never use the filter wrench to install — I've seen overtightening crush the gasket.
Swing the small access door shut and turn its plastic tabs a quarter turn to lock it. Lower the car off the stands or ramps onto level ground. Remove the oil fill cap, insert a funnel, and pour in 5W-30 engine oil to the specified capacity, about 4.2 to 4.5 quarts for the 2.5i EJ25, checking the dipstick as you near the top mark. Replace the fill cap tightly.
Start the engine and let it run about a minute while you watch the drain plug and filter area from under the hood and below for drips. A steady light and no drips mean the work is mechanically sound.
Shut the engine off, wait two minutes, then check the dipstick, wiping and re-dipping for an accurate read. Add small amounts of 5W-30 until the level sits at the upper mark. Look once more under the car for any fresh drips. Pour the used oil into a sealed container and recycle it and the old filter at an auto parts store. Record the date and mileage for the next interval.
Test your repair before closing everything up. If something doesn't work right, double-check your steps.
⚠️ Common Mistakes to Avoid
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